{"product_id":"dahua-dhi-ard821-w2-wireless-panic-button-airshield-reliable-emergency-alert-device","title":"Dahua DHI‑ARD821‑W2 Wireless Panic Button AirShield – Reliable Emergency Alert Device","description":"\u003cp data-start=\"270\" data-end=\"532\"\u003eThe Dahua DHI‑ARD821‑W2 Wireless Panic Button features two‑way RF communication, accidental press prevention, IP54 rating, cloud updates, and long battery life — perfect for emergency alerts in homes, offices, and retail environments.\u003c\/p\u003e\n\u003cp data-start=\"270\" data-end=\"532\"\u003e \u003c\/p\u003e\n\u003chr data-start=\"534\" data-end=\"537\"\u003e\n\u003ch2 data-start=\"539\" data-end=\"565\"\u003e\u003cstrong data-start=\"542\" data-end=\"565\"\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"567\" data-end=\"1144\"\u003eThe \u003cstrong data-start=\"571\" data-end=\"616\"\u003eDahua DHI‑ARD821‑W2 Wireless Panic Button\u003c\/strong\u003e is a compact and dependable emergency alert solution that delivers rapid, reliable two‑way communication in critical situations. Whether used to trigger alarms for intrusion, fire, gas leaks, or medical emergencies, this device ensures fast notifications to both the monitoring center and designated contacts. Built with an IP54-rated casing and offering accidental press prevention, it is suitable for residential and commercial spaces alike. Integration with Dahua alarm systems enhances responsiveness and remote management.\u003c\/p\u003e\n\u003cp data-start=\"567\" data-end=\"1144\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0637\/2838\/6287\/files\/Screenshot2026-01-29113903.png?v=1769647143\" alt=\"\"\u003e\u003c\/p\u003e\n\u003chr data-start=\"1146\" data-end=\"1149\"\u003e\n\u003ch2 data-start=\"1151\" data-end=\"1184\"\u003e\u003cstrong data-start=\"1154\" data-end=\"1184\"\u003eWhat’s Included in the Box\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"1186\" data-end=\"1332\"\u003e\n\u003cli data-start=\"1186\" data-end=\"1235\"\u003e\n\u003cp data-start=\"1188\" data-end=\"1235\"\u003e1 × Dahua DHI‑ARD821‑W2 Wireless Panic Button\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1236\" data-end=\"1319\"\u003e\n\u003cp data-start=\"1238\" data-end=\"1319\"\u003eInstallation Accessories (varies by model: standard, strap, or bracket version)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1320\" data-end=\"1332\"\u003e\n\u003cp data-start=\"1322\" data-end=\"1332\"\u003eUser Guide\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1334\" data-end=\"1337\"\u003e\n\u003ch2 data-start=\"1339\" data-end=\"1359\"\u003e\u003cstrong data-start=\"1342\" data-end=\"1359\"\u003eMain Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"1361\" data-end=\"2080\"\u003e\n\u003cli data-start=\"1361\" data-end=\"1476\"\u003e\n\u003cp data-start=\"1363\" data-end=\"1476\"\u003e\u003cstrong data-start=\"1363\" data-end=\"1392\"\u003eTwo-Way RF Communication:\u003c\/strong\u003e Ensures real-time signal confirmation between the panic button and the alarm hub.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1477\" data-end=\"1590\"\u003e\n\u003cp data-start=\"1479\" data-end=\"1590\"\u003e\u003cstrong data-start=\"1479\" data-end=\"1507\"\u003eMultiple LED Indicators:\u003c\/strong\u003e Displays pairing, signal strength, communication status, and low battery alerts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1591\" data-end=\"1696\"\u003e\n\u003cp data-start=\"1593\" data-end=\"1696\"\u003e\u003cstrong data-start=\"1593\" data-end=\"1617\"\u003eCloud-Based Updates:\u003c\/strong\u003e Enables remote firmware updates with automatic recovery from failed updates.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1697\" data-end=\"1780\"\u003e\n\u003cp data-start=\"1699\" data-end=\"1780\"\u003e\u003cstrong data-start=\"1699\" data-end=\"1731\"\u003eAccidental Press Prevention:\u003c\/strong\u003e Reduces false alarms for improved reliability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1781\" data-end=\"1888\"\u003e\n\u003cp data-start=\"1783\" data-end=\"1888\"\u003e\u003cstrong data-start=\"1783\" data-end=\"1803\"\u003eIP54 Protection:\u003c\/strong\u003e Resistant to dust and water splashes, ideal for indoor use in varied environments.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1889\" data-end=\"1997\"\u003e\n\u003cp data-start=\"1891\" data-end=\"1997\"\u003e\u003cstrong data-start=\"1891\" data-end=\"1917\"\u003eFlexible Installation:\u003c\/strong\u003e Wall-mounted or portable options (including versions with bracket or straps).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1998\" data-end=\"2080\"\u003e\n\u003cp data-start=\"2000\" data-end=\"2080\"\u003e\u003cstrong data-start=\"2000\" data-end=\"2020\"\u003eApp Integration:\u003c\/strong\u003e Battery level and device status viewable on the mobile app.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2082\" data-end=\"2085\"\u003e\n\u003ch2 data-start=\"2087\" data-end=\"2117\"\u003e\u003cstrong data-start=\"2090\" data-end=\"2117\"\u003eDetailed Specifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"2119\" data-end=\"2149\"\u003e\u003cstrong data-start=\"2119\" data-end=\"2147\"\u003eCommunication \u0026amp; Wireless\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"2150\" data-end=\"2371\"\u003e\n\u003cli data-start=\"2150\" data-end=\"2190\"\u003e\n\u003cp data-start=\"2152\" data-end=\"2190\"\u003e\u003cstrong data-start=\"2152\" data-end=\"2166\"\u003eFrequency:\u003c\/strong\u003e 433.1 MHz – 434.6 MHz\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2191\" data-end=\"2233\"\u003e\n\u003cp data-start=\"2193\" data-end=\"2233\"\u003e\u003cstrong data-start=\"2193\" data-end=\"2219\"\u003eDistance (Open Space):\u003c\/strong\u003e Up to 800 m\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2234\" data-end=\"2309\"\u003e\n\u003cp data-start=\"2236\" data-end=\"2309\"\u003e\u003cstrong data-start=\"2236\" data-end=\"2254\"\u003eCommunication:\u003c\/strong\u003e Two‑way with AES128 encryption and frequency hopping\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2310\" data-end=\"2348\"\u003e\n\u003cp data-start=\"2312\" data-end=\"2348\"\u003e\u003cstrong data-start=\"2312\" data-end=\"2342\"\u003eSignal Strength Indicator:\u003c\/strong\u003e Yes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2349\" data-end=\"2371\"\u003e\n\u003cp data-start=\"2351\" data-end=\"2371\"\u003e\u003cstrong data-start=\"2351\" data-end=\"2365\"\u003eTest Mode:\u003c\/strong\u003e Yes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2373\" data-end=\"2394\"\u003e\u003cstrong data-start=\"2373\" data-end=\"2392\"\u003ePower \u0026amp; Battery\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"2395\" data-end=\"2599\"\u003e\n\u003cli data-start=\"2395\" data-end=\"2423\"\u003e\n\u003cp data-start=\"2397\" data-end=\"2423\"\u003e\u003cstrong data-start=\"2397\" data-end=\"2414\"\u003eBattery Type:\u003c\/strong\u003e CR2032\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2424\" data-end=\"2485\"\u003e\n\u003cp data-start=\"2426\" data-end=\"2485\"\u003e\u003cstrong data-start=\"2426\" data-end=\"2443\"\u003eBattery Life:\u003c\/strong\u003e Up to 3 years (with use twice per week)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2486\" data-end=\"2518\"\u003e\n\u003cp data-start=\"2488\" data-end=\"2518\"\u003e\u003cstrong data-start=\"2488\" data-end=\"2510\"\u003eOperating Current:\u003c\/strong\u003e 28 mA\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2519\" data-end=\"2553\"\u003e\n\u003cp data-start=\"2521\" data-end=\"2553\"\u003e\u003cstrong data-start=\"2521\" data-end=\"2547\"\u003eLow Battery Detection:\u003c\/strong\u003e Yes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2554\" data-end=\"2599\"\u003e\n\u003cp data-start=\"2556\" data-end=\"2599\"\u003e\u003cstrong data-start=\"2556\" data-end=\"2582\"\u003eBattery Level Display:\u003c\/strong\u003e Via mobile app\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2601\" data-end=\"2614\"\u003e\u003cstrong data-start=\"2601\" data-end=\"2612\"\u003eGeneral\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"2615\" data-end=\"2964\"\u003e\n\u003cli data-start=\"2615\" data-end=\"2655\"\u003e\n\u003cp data-start=\"2617\" data-end=\"2655\"\u003e\u003cstrong data-start=\"2617\" data-end=\"2636\"\u003eOperating Temp:\u003c\/strong\u003e –10 °C to +55 °C\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2656\" data-end=\"2686\"\u003e\n\u003cp data-start=\"2658\" data-end=\"2686\"\u003e\u003cstrong data-start=\"2658\" data-end=\"2671\"\u003eHumidity:\u003c\/strong\u003e 10% – 90% RH\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2687\" data-end=\"2718\"\u003e\n\u003cp data-start=\"2689\" data-end=\"2718\"\u003e\u003cstrong data-start=\"2689\" data-end=\"2711\"\u003eProtection Rating:\u003c\/strong\u003e IP54\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2719\" data-end=\"2752\"\u003e\n\u003cp data-start=\"2721\" data-end=\"2752\"\u003e\u003cstrong data-start=\"2721\" data-end=\"2741\"\u003eCasing Material:\u003c\/strong\u003e PC + ABS\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2753\" data-end=\"2779\"\u003e\n\u003cp data-start=\"2755\" data-end=\"2779\"\u003e\u003cstrong data-start=\"2755\" data-end=\"2774\"\u003eCertifications:\u003c\/strong\u003e CE\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2780\" data-end=\"2824\"\u003e\n\u003cp data-start=\"2782\" data-end=\"2824\"\u003e\u003cstrong data-start=\"2782\" data-end=\"2799\"\u003eInstallation:\u003c\/strong\u003e Wall mount or portable\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2825\" data-end=\"2862\"\u003e\n\u003cp data-start=\"2827\" data-end=\"2862\"\u003e\u003cstrong data-start=\"2827\" data-end=\"2842\"\u003eDimensions:\u003c\/strong\u003e 55 × 36 × 14.2 mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2863\" data-end=\"2887\"\u003e\n\u003cp data-start=\"2865\" data-end=\"2887\"\u003e\u003cstrong data-start=\"2865\" data-end=\"2880\"\u003eNet Weight:\u003c\/strong\u003e 18 g\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2888\" data-end=\"2914\"\u003e\n\u003cp data-start=\"2890\" data-end=\"2914\"\u003e\u003cstrong data-start=\"2890\" data-end=\"2907\"\u003eGross Weight:\u003c\/strong\u003e 48 g\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2915\" data-end=\"2964\"\u003e\n\u003cp data-start=\"2917\" data-end=\"2964\"\u003e\u003cstrong data-start=\"2917\" data-end=\"2942\"\u003ePackaging Dimensions:\u003c\/strong\u003e 95 × 59.5 × 30.5 mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0637\/2838\/6287\/files\/Screenshot2026-01-29113909.png?v=1769647143\" alt=\"\"\u003e\u003c\/p\u003e\n\u003chr data-start=\"2966\" data-end=\"2969\"\u003e\n\u003ch2 data-start=\"2971\" data-end=\"2998\"\u003e\u003cstrong data-start=\"2974\" data-end=\"2998\"\u003eWarranty Information\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"3000\" data-end=\"3135\"\u003e\n\u003cli data-start=\"3000\" data-end=\"3036\"\u003e\n\u003cp data-start=\"3002\" data-end=\"3036\"\u003eManufacturer’s standard warranty\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3037\" data-end=\"3135\"\u003e\n\u003cp data-start=\"3039\" data-end=\"3135\"\u003eWarranty support available through authorized Dahua representatives in Australia and New Zealand\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3137\" data-end=\"3140\"\u003e\n\u003ch2 data-start=\"3142\" data-end=\"3163\"\u003e\u003cstrong data-start=\"3145\" data-end=\"3163\"\u003eBrand Overview\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3165\" data-end=\"3393\"\u003e\u003cstrong data-start=\"3165\" data-end=\"3185\"\u003eDahua Technology\u003c\/strong\u003e is a globally recognized provider of smart security solutions, offering a wide range of surveillance and alarm products trusted by professionals and homeowners worldwide for their reliability and innovation.\u003c\/p\u003e\n\u003chr data-start=\"3395\" data-end=\"3398\"\u003e\n\u003ch2 data-start=\"3400\" data-end=\"3410\"\u003e\u003cstrong data-start=\"3403\" data-end=\"3410\"\u003eSKU\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3412\" data-end=\"3429\"\u003e\u003cstrong data-start=\"3412\" data-end=\"3429\"\u003eDHI‑ARD821‑W2\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"3431\" data-end=\"3434\"\u003e\n\u003ch2 data-start=\"3436\" data-end=\"3466\"\u003e\u003cstrong data-start=\"3439\" data-end=\"3466\"\u003ePractical Use Scenarios\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3468\" data-end=\"3858\"\u003e✔ \u003cstrong data-start=\"3470\" data-end=\"3492\"\u003eResidential Homes:\u003c\/strong\u003e Elderly or vulnerable individuals can signal emergencies such as falls or health concerns.\u003cbr data-start=\"3583\" data-end=\"3586\"\u003e✔ \u003cstrong data-start=\"3588\" data-end=\"3620\"\u003eOffices \u0026amp; Commercial Spaces:\u003c\/strong\u003e Silent alarms for intrusion or hold-up events.\u003cbr data-start=\"3667\" data-end=\"3670\"\u003e✔ \u003cstrong data-start=\"3672\" data-end=\"3690\"\u003eRetail Stores:\u003c\/strong\u003e Staff-triggered panic alert for security incidents or emergencies.\u003cbr data-start=\"3757\" data-end=\"3760\"\u003e✔ \u003cstrong data-start=\"3762\" data-end=\"3786\"\u003eApartments \u0026amp; Villas:\u003c\/strong\u003e Integrates with home alarm systems for gas, fire, and intrusion alerts.\u003c\/p\u003e\n\u003chr data-start=\"3860\" data-end=\"3863\"\u003e\n\u003ch2 data-start=\"3865\" data-end=\"3894\"\u003e\u003cstrong data-start=\"3868\" data-end=\"3894\"\u003eDatasheets \u0026amp; Resources\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"3896\" data-end=\"4046\"\u003e\n\u003cli data-start=\"3896\" data-end=\"3990\"\u003e\n\u003cp data-start=\"3898\" data-end=\"3990\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0637\/2838\/6287\/files\/DAHI9978_DHI-ARD821-W2_datasheet_1.pdf?v=1769646924\"\u003eOfficial Product Datasheet\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4048\" data-end=\"4051\"\u003e\n\u003ch2 data-start=\"4053\" data-end=\"4112\"\u003e\u003cstrong data-start=\"4056\" data-end=\"4112\"\u003eExcellence for the Australian and New Zealand Market\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"4114\" data-end=\"4588\"\u003eThe \u003cstrong data-start=\"4118\" data-end=\"4163\"\u003eDahua DHI‑ARD821‑W2 Wireless Panic Button\u003c\/strong\u003e is RCM certified and tailored to meet the rigorous safety standards of Australia and New Zealand. Designed for reliable performance in local conditions, it is sourced through authorized Dahua partners, ensuring dependable after‑sales support and warranty coverage. Firmware updates and product servicing are handled directly through regional support channels, giving installers and users confidence in long‑term reliability.\u003c\/p\u003e\n\u003chr data-start=\"4590\" data-end=\"4593\"\u003e\n\u003ch2 data-start=\"4595\" data-end=\"4620\"\u003e\u003cstrong data-start=\"4598\" data-end=\"4620\"\u003eFAQs\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"4622\" data-end=\"4910\"\u003e\u003cstrong data-start=\"4622\" data-end=\"4722\"\u003e1. What is the Dahua DHI‑ARD821‑W2 Wireless Panic Button used for? (Product Code: DHI‑ARD821‑W2)\u003c\/strong\u003e\u003cbr data-start=\"4722\" data-end=\"4725\"\u003eThe DHI‑ARD821‑W2 is designed to trigger immediate alerts for intrusions, fire, gas leaks, or medical emergencies, sending notifications to monitoring centers and linked mobile devices.\u003c\/p\u003e\n\u003cp data-start=\"4912\" data-end=\"5088\"\u003e\u003cstrong data-start=\"4912\" data-end=\"5010\"\u003e2. How far can the DHI‑ARD821‑W2 communicate with the alarm hub? (Product Code: DHI‑ARD821‑W2)\u003c\/strong\u003e\u003cbr data-start=\"5010\" data-end=\"5013\"\u003eIt supports a wireless communication distance of up to 800 m in open space.\u003c\/p\u003e\n\u003cp data-start=\"5090\" data-end=\"5279\"\u003e\u003cstrong data-start=\"5090\" data-end=\"5179\"\u003e3. Does the Dahua DHI‑ARD821‑W2 support remote updates? (Product Code: DHI‑ARD821‑W2)\u003c\/strong\u003e\u003cbr data-start=\"5179\" data-end=\"5182\"\u003eYes. The device supports cloud-based firmware updates with automatic recovery in case of failure.\u003c\/p\u003e\n\u003cp data-start=\"5281\" data-end=\"5463\"\u003e\u003cstrong data-start=\"5281\" data-end=\"5355\"\u003e4. Is the DHI‑ARD821‑W2 water-resistant? (Product Code: DHI‑ARD821‑W2)\u003c\/strong\u003e\u003cbr data-start=\"5355\" data-end=\"5358\"\u003eYes. It has an IP54 rating, making it resistant to dust and water splashes—ideal for indoor environments.\u003c\/p\u003e\n\u003cp data-start=\"5465\" data-end=\"5655\"\u003e\u003cstrong data-start=\"5465\" data-end=\"5567\"\u003e5. How long does the battery last in the DHI‑ARD821‑W2 panic button? (Product Code: DHI‑ARD821‑W2)\u003c\/strong\u003e\u003cbr data-start=\"5567\" data-end=\"5570\"\u003eThe CR2032 battery offers a life of up to 3 years with standard use (twice per week).\u003c\/p\u003e","brand":"CCTV Tradie","offers":[{"title":"Default Title","offer_id":44530428969063,"sku":"DHI-ARD821-W2-SED","price":48.96,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/8268\/2471\/files\/DAHI9978_DHI-ARD821-W2_product-image_1.png?v=1788078043","url":"https:\/\/shop.underbrella.com.au\/products\/dahua-dhi-ard821-w2-wireless-panic-button-airshield-reliable-emergency-alert-device","provider":"UnderBrella","version":"1.0","type":"link"}