{"product_id":"dahua-smoke-detector-hy-sa21a-w2","title":"Dahua Smoke Detector HY-SA21A-W2","description":"\u003cstyle\u003e\n.dahua-product *{\n    font-family: Arial, sans-serif;\n}\n\n.dahua-product{\n    color:#444;\n}\n\n\/* Main Heading *\/\n.dahua-product h2{\n    background:linear-gradient(135deg,#1f1f1f,#383838);\n    color:#fff;\n    padding:14px 20px;\n    border-radius:10px;\n    margin-top:35px;\n    font-size:26px;\n    letter-spacing:0.5px;\n}\n\n\/* Sub Heading *\/\n.dahua-product h3{\n    color:#a94442;\n    margin-bottom:8px;\n}\n\n\/* Paragraph *\/\n.dahua-product p{\n    line-height:1.8;\n    color:#555;\n}\n\n\/* Feature Cards *\/\n.feature-box{\n    background:#fafafa;\n    border-left:5px solid #c96a6a;\n    padding:18px 22px;\n    margin-bottom:18px;\n    border-radius:12px;\n    transition:all .3s ease;\n    box-shadow:0 2px 8px rgba(0,0,0,.06);\n}\n\n.feature-box:hover{\n    transform:translateY(-4px);\n    box-shadow:0 8px 20px rgba(0,0,0,.12);\n}\n\n\/* Specification Table *\/\n.spec-table{\n    width:100%;\n    border-collapse:collapse;\n    margin-top:20px;\n    border-radius:12px;\n    overflow:hidden;\n}\n\n.spec-table th{\n    background:#2c2c2c;\n    color:white;\n    padding:14px;\n    font-weight:600;\n}\n\n.spec-table td{\n    padding:14px;\n    border:1px solid #ececec;\n}\n\n.spec-table tr:nth-child(even){\n    background:#f8f8f8;\n}\n\n.spec-table tr:hover{\n    background:#fff4f4;\n}\n\n\/* List Style *\/\n.dahua-product ul{\n    padding-left:20px;\n}\n\n.dahua-product li{\n    margin-bottom:12px;\n}\n\n\/* Mobile Responsive *\/\n@media(max-width:768px){\n\n.dahua-product h2{\n    font-size:22px;\n    padding:12px 16px;\n}\n\n.feature-box{\n    padding:15px;\n}\n\n.spec-table th,\n.spec-table td{\n    padding:10px;\n    font-size:14px;\n}\n\n}\n\u003c\/style\u003e\n\n\u003cdiv class=\"dahua-product\"\u003e\n\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\n\u003cp\u003e\nThe \u003cstrong\u003eDahua HY-SA21A-W2 Wireless Smoke Detector\u003c\/strong\u003e is an intelligent photoelectric smoke alarm designed to provide early fire detection and reliable protection for residential and commercial environments. Utilizing advanced split-spectrum sensor technology, the detector offers high sensitivity to smoke while reducing unwanted alarms.\n\u003c\/p\u003e\n\n\u003cp\u003e\nThe device combines smoke detection and alarm functions in a single unit and can transmit alarm events to compatible Dahua wireless alarm hubs. Instant notifications can be viewed through the DMSS mobile application, allowing users to react quickly to fire emergencies.\n\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n✔ Split-spectrum photoelectric smoke sensing technology\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n✔ Loud alarm output of 85–90 dB(A) at 3 m\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n✔ Visual and audible alarm indication\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n✔ Test and silence functions integrated into one button\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n✔ Two-way wireless communication\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n✔ AES128 encryption for secure transmission\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n✔ Frequency hopping technology\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n✔ Low battery warning and fault indication\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n✔ Low quiescent current consumption\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n✔ Surface-mount device (SMD) circuit design\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n✔ Communication range up to 1,000 m in open space\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n✔ Battery life up to 3 years\n\u003c\/div\u003e\n\n\u003ch2\u003eWhy Choose Dahua HY-SA21A-W2?\u003c\/h2\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n\u003ch3\u003eEarly Fire Detection\u003c\/h3\u003e\n\u003cp\u003e\nAdvanced photoelectric sensing technology provides reliable smoke detection for enhanced life and property protection.\n\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n\u003ch3\u003eEasy Operation\u003c\/h3\u003e\n\u003cp\u003e\nA single button allows users to test the detector and temporarily silence nuisance alarms.\n\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n\u003ch3\u003eReliable Wireless Communication\u003c\/h3\u003e\n\u003cp\u003e\nTwo-way communication with AES128 encryption ensures secure and dependable signal transmission to the alarm hub.\n\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n\u003ch3\u003eLong Battery Life\u003c\/h3\u003e\n\u003cp\u003e\nThe replaceable CR123A lithium battery provides up to three years of operation, minimizing maintenance requirements.\n\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n\u003ch3\u003eInstant Alarm Notifications\u003c\/h3\u003e\n\u003cp\u003e\nCompatible with Dahua wireless alarm systems, enabling real-time alarm notifications through the DMSS mobile application.\n\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable class=\"spec-table\"\u003e\n\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eWireless Smoke Detector\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eDetection Principle\u003c\/td\u003e\n\u003ctd\u003ePhotoelectric Smoke Detection\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eSensor Technology\u003c\/td\u003e\n\u003ctd\u003eSplit-Spectrum Sensor Technology\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eSampling Period\u003c\/td\u003e\n\u003ctd\u003e10 Seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eAlarm Type\u003c\/td\u003e\n\u003ctd\u003eSmoke Alarm, Fault Warning, Low Battery Warning\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eAlarm Mode\u003c\/td\u003e\n\u003ctd\u003eVisual and Audible Alarm\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eAlarm Volume\u003c\/td\u003e\n\u003ctd\u003e85–90 dB(A) at 3 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eSilence Function\u003c\/td\u003e\n\u003ctd\u003eSupported\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eSilence Duration\u003c\/td\u003e\n\u003ctd\u003eApproximately 12 Minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eAlarm Response Threshold\u003c\/td\u003e\n\u003ctd\u003e0.2 dB\/m – 0.3 dB\/m\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eIndicator LEDs\u003c\/td\u003e\n\u003ctd\u003eRed and Green LED Indicators\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eCoverage Area\u003c\/td\u003e\n\u003ctd\u003e20 m² – 40 m² (Ceiling Height Below 8 m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eCommunication Mechanism\u003c\/td\u003e\n\u003ctd\u003eTwo-Way Wireless Communication\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eEncryption Mode\u003c\/td\u003e\n\u003ctd\u003eAES128\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eFrequency Hopping\u003c\/td\u003e\n\u003ctd\u003eSupported\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eWireless Frequency\u003c\/td\u003e\n\u003ctd\u003e433.1 MHz – 434.6 MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eCommunication Distance\u003c\/td\u003e\n\u003ctd\u003eUp to 1,000 m (Open Area)\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003e1 × 3V CR123A Lithium Battery (Replaceable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eBattery Life\u003c\/td\u003e\n\u003ctd\u003eUp to 3 Years\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eMonitoring Current\u003c\/td\u003e\n\u003ctd\u003e≤ 35 μA\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eAlarm Current\u003c\/td\u003e\n\u003ctd\u003e≤ 35 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eOperating Environment\u003c\/td\u003e\n\u003ctd\u003eIndoor\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-10°C to +55°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eOperating Humidity\u003c\/td\u003e\n\u003ctd\u003e≤ 95% RH (Non-Condensing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eCeiling Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eCasing Material\u003c\/td\u003e\n\u003ctd\u003eABS\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eØ98 mm × 43.1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e140 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eTÜV, CE\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eCompliance Standard\u003c\/td\u003e\n\u003ctd\u003eEN 14604:2005 + AC:2008\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003c\/table\u003e\n\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n🏠 Homes and Villas\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n🏢 Offices and Commercial Buildings\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n🏬 Retail Stores and Shops\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n🏨 Hotels and Hospitality Facilities\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n🏫 Educational Institutions\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n🏥 Healthcare Facilities\n\u003c\/div\u003e\n\n\u003cdiv class=\"feature-box\"\u003e\n🏠 Apartments and Residential Complexes\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Dahua Technology","offers":[{"title":"Default Title","offer_id":55263328436515,"sku":null,"price":3200.0,"currency_code":"INR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/4125\/3411\/files\/dhi_hy_sa21a_w2_868_smoke_detector.jpg?v=1781936989","url":"https:\/\/attendancemachine.in\/products\/dahua-smoke-detector-hy-sa21a-w2","provider":"Attendance Machine","version":"1.0","type":"link"}