{"product_id":"dahua-wireless-smoke-alarm-dhi-hy-sa21a-w2-battery-powered-split-spectrum-photoelectric-85-db-output-3-year-battery-life","title":"Dahua Wireless Smoke Alarm DHI‑HY‑SA21A‑W2 – Battery‑Powered, Split‑Spectrum Photoelectric, 85 dB Output, 3‑Year Battery Life","description":"\u003cp data-end=\"804\" data-start=\"341\"\u003eThe \u003cstrong data-end=\"391\" data-start=\"345\"\u003eDahua DHI‑HY‑SA21A‑W2 Wireless Smoke Alarm\u003c\/strong\u003e is a high‑performance, battery‑powered smoke detection unit designed for residential and light commercial settings. It integrates advanced split‑spectrum photoelectric sensing with low power consumption and wireless connectivity to deliver early smoke detection and fast alerting—without needing mains wiring. Notifications can also be relayed through Dahua’s DMSS app in real time for enhanced safety awareness.\u003c\/p\u003e\n\u003cp data-end=\"942\" data-start=\"806\"\u003eThis model is ideal for villas, shops, apartments, and other indoor spaces where minimal wiring and reliable smoke sensing are required.\u003c\/p\u003e\n\u003chr data-end=\"947\" data-start=\"944\"\u003e\n\u003ch2 data-end=\"982\" data-start=\"949\"\u003e✅ What’s Included in the Box\u003c\/h2\u003e\n\u003cul data-end=\"1165\" data-start=\"983\"\u003e\n\u003cli data-end=\"1033\" data-start=\"983\"\u003e\n\u003cp data-end=\"1033\" data-start=\"985\"\u003e1 × Dahua DHI‑HY‑SA21A‑W2 Wireless Smoke Alarm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1068\" data-start=\"1034\"\u003e\n\u003cp data-end=\"1068\" data-start=\"1036\"\u003eMounting screws and wall plugs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1099\" data-start=\"1069\"\u003e\n\u003cp data-end=\"1099\" data-start=\"1071\"\u003eUser \/ installation manual\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1165\" data-start=\"1100\"\u003e\n\u003cp data-end=\"1165\" data-start=\"1102\"\u003eBattery (CR123A) — typically included (confirm with supplier)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"1170\" data-start=\"1167\"\u003e\n\u003ch2 data-end=\"1193\" data-start=\"1172\"\u003e🌟 Main Features\u003c\/h2\u003e\n\u003cul data-end=\"1929\" data-start=\"1194\"\u003e\n\u003cli data-end=\"1294\" data-start=\"1194\"\u003e\n\u003cp data-end=\"1294\" data-start=\"1196\"\u003eSplit‑spectrum photoelectric sensor technology for improved sensitivity and reduced false alarms\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1395\" data-start=\"1295\"\u003e\n\u003cp data-end=\"1395\" data-start=\"1297\"\u003eTest \u0026amp; Silence single button: easily test the alarm or silence nuisance triggers for ~12 minutes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1450\" data-start=\"1396\"\u003e\n\u003cp data-end=\"1450\" data-start=\"1398\"\u003eLoud alarm output: ≥ 85 dB(A) at 3 meters distance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1514\" data-start=\"1451\"\u003e\n\u003cp data-end=\"1514\" data-start=\"1453\"\u003eLow quiescent current consumption for extended battery life\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1630\" data-start=\"1515\"\u003e\n\u003cp data-end=\"1630\" data-start=\"1517\"\u003eWireless communication (433.1 MHz – 434.6 MHz) with two‑way signaling, frequency hopping, and AES128 encryption\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1687\" data-start=\"1631\"\u003e\n\u003cp data-end=\"1687\" data-start=\"1633\"\u003eLong communication range—up to 1000 m in open spaces\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1760\" data-start=\"1688\"\u003e\n\u003cp data-end=\"1760\" data-start=\"1690\"\u003eMulti‑alarm types: smoke alarm, fault warning, and low battery alert\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1857\" data-start=\"1761\"\u003e\n\u003cp data-end=\"1857\" data-start=\"1763\"\u003eVisual \u0026amp; audible signaling: red \u0026amp; green LEDs for status (standby, alarm, fault, battery low)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1929\" data-start=\"1858\"\u003e\n\u003cp data-end=\"1929\" data-start=\"1860\"\u003eCE \u0026amp; TÜV certified, compliant with EN 14604:2005 + AC:2008 standard\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"1934\" data-start=\"1931\"\u003e\n\u003ch2 data-end=\"1967\" data-start=\"1936\"\u003e📊 Detailed Specifications\u003c\/h2\u003e\n\u003cdiv class=\"_tableContainer_1rjym_1\"\u003e\n\u003cdiv class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\" data-end=\"3172\" data-start=\"1969\"\u003e\n\u003cthead data-end=\"1998\" data-start=\"1969\"\u003e\n\u003ctr data-end=\"1998\" data-start=\"1969\"\u003e\n\u003cth data-col-size=\"sm\" data-end=\"1981\" data-start=\"1969\"\u003eParameter\u003c\/th\u003e\n\u003cth data-col-size=\"md\" data-end=\"1998\" data-start=\"1981\"\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-end=\"3172\" data-start=\"2009\"\u003e\n\u003ctr data-end=\"2054\" data-start=\"2009\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2035\" data-start=\"2009\"\u003e\u003cstrong data-end=\"2034\" data-start=\"2011\"\u003eModel \/ Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"2054\" data-start=\"2035\"\u003eDHI‑HY‑SA21A‑W2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"2115\" data-start=\"2055\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2081\" data-start=\"2055\"\u003e\u003cstrong data-end=\"2080\" data-start=\"2057\"\u003eDetection Principle\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"2115\" data-start=\"2081\"\u003ePhotoelectric (split‑spectrum)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"2152\" data-start=\"2116\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2138\" data-start=\"2116\"\u003e\u003cstrong data-end=\"2137\" data-start=\"2118\"\u003eSampling Period\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"2152\" data-start=\"2138\"\u003e10 seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"2222\" data-start=\"2153\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2171\" data-start=\"2153\"\u003e\u003cstrong data-end=\"2170\" data-start=\"2155\"\u003eAlarm Types\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"2222\" data-start=\"2171\"\u003eSmoke alarm, fault warning, low battery warning\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"2282\" data-start=\"2223\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2251\" data-start=\"2223\"\u003e\u003cstrong data-end=\"2250\" data-start=\"2225\"\u003eAlarm Output \/ Volume\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"2282\" data-start=\"2251\"\u003e85 dB(A) to 90 dB(A) at 3 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"2322\" data-start=\"2283\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2306\" data-start=\"2283\"\u003e\u003cstrong data-end=\"2305\" data-start=\"2285\"\u003eSilence Duration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"2322\" data-start=\"2306\"\u003e~ 12 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"2377\" data-start=\"2323\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2354\" data-start=\"2323\"\u003e\u003cstrong data-end=\"2353\" data-start=\"2325\"\u003eAlarm Response Threshold\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"2377\" data-start=\"2354\"\u003e0.2 dB\/m – 0.3 dB\/m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"2443\" data-start=\"2378\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2398\" data-start=\"2378\"\u003e\u003cstrong data-end=\"2397\" data-start=\"2380\"\u003eCoverage Area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"2443\" data-start=\"2398\"\u003e20 m² to 40 m² (for ceiling height \u0026lt; 8 m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"2503\" data-start=\"2444\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2466\" data-start=\"2444\"\u003e\u003cstrong data-end=\"2465\" data-start=\"2446\"\u003eBattery \/ Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"2503\" data-start=\"2466\"\u003e3 V (CR123A lithium, replaceable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"2573\" data-start=\"2504\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2523\" data-start=\"2504\"\u003e\u003cstrong data-end=\"2522\" data-start=\"2506\"\u003eBattery Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"2573\" data-start=\"2523\"\u003eUp to 3 years under normal stand-by conditions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"2639\" data-start=\"2574\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2598\" data-start=\"2574\"\u003e\u003cstrong data-end=\"2597\" data-start=\"2576\"\u003eOperating Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"2639\" data-start=\"2598\"\u003e≤ 35 µA (monitoring), ≤ 35 mA (alarm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"2688\" data-start=\"2640\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2668\" data-start=\"2640\"\u003e\u003cstrong data-end=\"2667\" data-start=\"2642\"\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"2688\" data-start=\"2668\"\u003e–10 °C to +55 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"2744\" data-start=\"2689\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2714\" data-start=\"2689\"\u003e\u003cstrong data-end=\"2713\" data-start=\"2691\"\u003eOperating Humidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"2744\" data-start=\"2714\"\u003e≤ 95 % RH (non‑condensing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"2791\" data-start=\"2745\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2770\" data-start=\"2745\"\u003e\u003cstrong data-end=\"2769\" data-start=\"2747\"\u003eWireless Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"2791\" data-start=\"2770\"\u003e433.1 – 434.6 MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"2861\" data-start=\"2792\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2812\" data-start=\"2792\"\u003e\u003cstrong data-end=\"2811\" data-start=\"2794\"\u003eCommunication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"2861\" data-start=\"2812\"\u003eTwo‑way, frequency hopping, AES128 encryption\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"2940\" data-start=\"2862\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2895\" data-start=\"2862\"\u003e\u003cstrong data-end=\"2894\" data-start=\"2864\"\u003eMax Communication Distance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"2940\" data-start=\"2895\"\u003eUp to 1000 m (line-of-sight \/ open space)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"3008\" data-start=\"2941\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"2974\" data-start=\"2941\"\u003e\u003cstrong data-end=\"2973\" data-start=\"2943\"\u003eCertifications \/ Standards\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"3008\" data-start=\"2974\"\u003eCE, TÜV, EN 14604:2005+AC:2008\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"3054\" data-start=\"3009\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"3026\" data-start=\"3009\"\u003e\u003cstrong data-end=\"3025\" data-start=\"3011\"\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"3054\" data-start=\"3026\"\u003eØ 98 mm × 43.1 mm height\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"3077\" data-start=\"3055\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"3068\" data-start=\"3055\"\u003e\u003cstrong data-end=\"3067\" data-start=\"3057\"\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"3077\" data-start=\"3068\"\u003e140 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"3123\" data-start=\"3078\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"3109\" data-start=\"3078\"\u003e\u003cstrong data-end=\"3108\" data-start=\"3080\"\u003eHousing Material \/ Color\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"3123\" data-start=\"3109\"\u003eABS, white\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"3172\" data-start=\"3124\"\u003e\n\u003ctd data-col-size=\"sm\" data-end=\"3139\" data-start=\"3124\"\u003e\u003cstrong data-end=\"3138\" data-start=\"3126\"\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-end=\"3172\" data-start=\"3139\"\u003eCeiling mount (surface mount)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr data-end=\"3177\" data-start=\"3174\"\u003e\n\u003ch2 data-end=\"3207\" data-start=\"3179\"\u003e🛠 Warranty Information\u003c\/h2\u003e\n\u003cp data-end=\"3468\" data-start=\"3208\"\u003eWarranty terms typically depend on your distributor or local Dahua representative. Confirm warranty duration (often 1–2 years) and service details (repair vs replacement) with your supplier. Be sure to record the serial number and purchase date for any claims.\u003c\/p\u003e\n\u003chr data-end=\"3473\" data-start=\"3470\"\u003e\n\u003ch2 data-end=\"3505\" data-start=\"3475\"\u003e🏷 Brand (Dahua) Overview\u003c\/h2\u003e\n\u003cp data-end=\"3922\" data-start=\"3506\"\u003eDahua Technology is a globally recognized leader in video surveillance, security, and IoT solutions. Their product portfolio spans video, alarm, access control, and integrated platform systems. Dahua emphasizes high reliability, interoperability, and consistent updates. Their AirShield wireless ecosystem (into which this smoke alarm integrates) supports remote control, alarm-video linkage, and cloud connectivity.\u003c\/p\u003e\n\u003chr data-end=\"3927\" data-start=\"3924\"\u003e\n\u003ch2 data-end=\"3960\" data-start=\"3929\"\u003e🧩 Practical Use Scenarios\u003c\/h2\u003e\n\u003cul data-end=\"4424\" data-start=\"3961\"\u003e\n\u003cli data-end=\"4086\" data-start=\"3961\"\u003e\n\u003cp data-end=\"4086\" data-start=\"3963\"\u003e\u003cstrong data-end=\"4007\" data-start=\"3963\"\u003eResidential homes \/ single‑family houses\u003c\/strong\u003e — ideal for rooms, hallways, or other indoor zones where wiring is difficult\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4166\" data-start=\"4087\"\u003e\n\u003cp data-end=\"4166\" data-start=\"4089\"\u003e\u003cstrong data-end=\"4117\" data-start=\"4089\"\u003eApartments \u0026amp; condo units\u003c\/strong\u003e — wireless ease avoids disruptive installation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4261\" data-start=\"4167\"\u003e\n\u003cp data-end=\"4261\" data-start=\"4169\"\u003e\u003cstrong data-end=\"4200\" data-start=\"4169\"\u003eRetail stores \/ small shops\u003c\/strong\u003e — to provide early smoke warning in sales or storage areas\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4348\" data-start=\"4262\"\u003e\n\u003cp data-end=\"4348\" data-start=\"4264\"\u003e\u003cstrong data-end=\"4303\" data-start=\"4264\"\u003eRental properties \/ serviced villas\u003c\/strong\u003e — quick deployment and minimal maintenance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4424\" data-start=\"4349\"\u003e\n\u003cp data-end=\"4424\" data-start=\"4351\"\u003e\u003cstrong data-end=\"4383\" data-start=\"4351\"\u003eRetrofitting older buildings\u003c\/strong\u003e without existing fire detection wiring\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"4569\" data-start=\"4426\"\u003ePairing multiple units in a hub or zone allows broader coverage and centralized alarm propagation (if supported by the AirShield \/ hub system).\u003c\/p\u003e\n\u003cp data-end=\"4569\" data-start=\"4426\"\u003e\u003ca href=\"https:\/\/material.dahuasecurity.com\/uploads\/soft\/20240507\/DHI-HY-SA21A-W2_datasheet_20240507.pdf\"\u003eDATASHEET\u003c\/a\u003e\u003c\/p\u003e\n\u003chr data-end=\"4574\" data-start=\"4571\"\u003e\n\u003ch2 data-end=\"4638\" data-start=\"4576\"\u003e🇦🇺 Excellence for the Australian and New Zealand Market\u003c\/h2\u003e\n\u003cul data-end=\"5321\" data-start=\"4639\"\u003e\n\u003cli data-end=\"4810\" data-start=\"4639\"\u003e\n\u003cp data-end=\"4810\" data-start=\"4641\"\u003eThis smoke alarm meets \u003cstrong data-end=\"4685\" data-start=\"4664\"\u003eEuropean EN 14604\u003c\/strong\u003e standards and carries \u003cstrong data-end=\"4734\" data-start=\"4708\"\u003eCE \/ TÜV certification\u003c\/strong\u003e, which is widely accepted in Australia\/NZ (verify local code compliance).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4954\" data-start=\"4811\"\u003e\n\u003cp data-end=\"4954\" data-start=\"4813\"\u003eIt is compatible with Dahua’s \u003cstrong data-end=\"4884\" data-start=\"4843\"\u003eAirShield wireless security ecosystem\u003c\/strong\u003e, supporting smart linking with CCTV, alarm panels, and mobile apps.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"5082\" data-start=\"4955\"\u003e\n\u003cp data-end=\"5082\" data-start=\"4957\"\u003eThe product should be sourced from \u003cstrong data-end=\"5025\" data-start=\"4992\"\u003eauthorized Dahua distributors\u003c\/strong\u003e to ensure authenticity, warranty backing, and support.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"5184\" data-start=\"5083\"\u003e\n\u003cp data-end=\"5184\" data-start=\"5085\"\u003eFor Australian customers, ensure installation complies with \u003cstrong data-end=\"5156\" data-start=\"5145\"\u003eAS 3786\u003c\/strong\u003e (Smoke alarms, domestic).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"5321\" data-start=\"5185\"\u003e\n\u003cp data-end=\"5321\" data-start=\"5187\"\u003eWarranty and service support should be confirmed locally with the Australian \/ NZ Dahua distributor to ensure prompt after-sales care.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"5326\" data-start=\"5323\"\u003e\n\u003ch2 data-end=\"5375\" data-start=\"5328\"\u003e❓ FAQs (with Product Code DHI‑HY‑SA21A‑W2)\u003c\/h2\u003e\n\u003cp data-end=\"5587\" data-start=\"5377\"\u003e\u003cstrong data-end=\"5432\" data-start=\"5377\"\u003eQ: What is the power source of the DHI‑HY‑SA21A‑W2?\u003c\/strong\u003e\u003cbr data-end=\"5435\" data-start=\"5432\"\u003eA: The DHI‑HY‑SA21A‑W2 is powered by a single 3 V CR123A lithium battery (replaceable), providing up to 3 years of standby life under normal conditions.\u003c\/p\u003e\n\u003cp data-end=\"5759\" data-start=\"5589\"\u003e\u003cstrong data-end=\"5654\" data-start=\"5589\"\u003eQ: What sound level (dB) does DHI‑HY‑SA21A‑W2 produce at 3 m?\u003c\/strong\u003e\u003cbr data-end=\"5657\" data-start=\"5654\"\u003eA: The DHI‑HY‑SA21A‑W2 alarm produces an audible output of at least 85 dB(A) (and up to 90 dB) at 3 m.\u003c\/p\u003e\n\u003cp data-end=\"5966\" data-start=\"5761\"\u003e\u003cstrong data-end=\"5830\" data-start=\"5761\"\u003eQ: Does DHI‑HY‑SA21A‑W2 support wireless communication \/ linking?\u003c\/strong\u003e\u003cbr data-end=\"5833\" data-start=\"5830\"\u003eA: Yes, the DHI‑HY‑SA21A‑W2 supports two‑way wireless communication with frequency hopping (433.1 – 434.6 MHz) and AES128 encryption.\u003c\/p\u003e\n\u003cp data-end=\"6126\" data-start=\"5968\"\u003e\u003cstrong data-end=\"6028\" data-start=\"5968\"\u003eQ: How many square meters can one DHI‑HY‑SA21A‑W2 cover?\u003c\/strong\u003e\u003cbr data-end=\"6031\" data-start=\"6028\"\u003eA: For ceiling heights under 8 m, one unit of DHI‑HY‑SA21A‑W2 covers approximately 20 to 40 m².\u003c\/p\u003e\n\u003cp data-end=\"6274\" data-start=\"6128\"\u003e\u003cstrong data-end=\"6182\" data-start=\"6128\"\u003eQ: What certifications does DHI‑HY‑SA21A‑W2 carry?\u003c\/strong\u003e\u003cbr data-end=\"6185\" data-start=\"6182\"\u003eA: The DHI‑HY‑SA21A‑W2 is TÜV and CE certified and complies with EN 14604:2005 + AC:2008.\u003c\/p\u003e\n\u003cp data-end=\"6483\" data-start=\"6276\"\u003e\u003cstrong data-end=\"6336\" data-start=\"6276\"\u003eQ: Is there a silence \/ hush feature in DHI‑HY‑SA21A‑W2?\u003c\/strong\u003e\u003cbr data-end=\"6339\" data-start=\"6336\"\u003eA: Yes, the DHI‑HY‑SA21A‑W2 includes a built‑in silence function via its control button, which temporarily mutes the alarm for about 12 minutes.\u003c\/p\u003e\n\u003cp data-end=\"6687\" data-start=\"6485\"\u003e\u003cstrong data-end=\"6561\" data-start=\"6485\"\u003eQ: What is the operating temperature\/humidity range for DHI‑HY‑SA21A‑W2?\u003c\/strong\u003e\u003cbr data-end=\"6564\" data-start=\"6561\"\u003eA: The DHI‑HY‑SA21A‑W2 operates between –10 °C to +55 °C and can function in humidity levels up to 95% RH (non‑condensing).\u003c\/p\u003e","brand":"CCTV Tradie","offers":[{"title":"Default Title","offer_id":44530421235815,"sku":"DHI-HY-SA21A-W2-SED","price":74.46,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/8268\/2471\/files\/DAHI9984_DHI-HY-SA21A-W2_product-image_1.png?v=1788077805","url":"https:\/\/shop.underbrella.com.au\/products\/dahua-wireless-smoke-alarm-dhi-hy-sa21a-w2-battery-powered-split-spectrum-photoelectric-85-db-output-3-year-battery-life","provider":"UnderBrella","version":"1.0","type":"link"}