{"id":23013,"date":"2025-04-29T11:14:00","date_gmt":"2025-04-29T04:14:00","guid":{"rendered":"https:\/\/kawasan.vn\/?post_type=product&#038;p=23013"},"modified":"2026-09-16T15:14:58","modified_gmt":"2026-09-16T08:14:58","slug":"coi-bao-dong-al21","status":"publish","type":"product","link":"https:\/\/kawasan.vn\/en\/product\/coi-bao-dong-al21\/","title":{"rendered":"AL21 WIRELESS ALARM SIREN"},"content":{"rendered":"<h2><span class=\"ez-toc-section\" id=\"GIOI_THIEU_SAN_PHAM\"><\/span><b>PRODUCT INTRODUCTION<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_69_1 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" >N\u1ed9i Dung B&agrave;i Vi\u1ebft<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kawasan.vn\/en\/product\/coi-bao-dong-al21\/#GIOI_THIEU_SAN_PHAM\" title=\"PRODUCT INTRODUCTION\">PRODUCT INTRODUCTION<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kawasan.vn\/en\/product\/coi-bao-dong-al21\/#Tuong_thich_linh_hoat_%E2%80%93_Ket_hop_hieu_qua_voi_nhieu_thiet_bi_khac\" title=\"Flexible Compatibility \u2013 Effective Integration with Multiple Devices\">Flexible Compatibility \u2013 Effective Integration with Multiple Devices<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kawasan.vn\/en\/product\/coi-bao-dong-al21\/#Coi_bao_dong_khong_day_AL21_khong_chi_hoat_dong_doc_lap_ma_con_co_the_ket_noi_linh_hoat_voi_nhieu_thiet_bi_canh_bao_khong_day_khac_cua_Kawasan_tao_thanh_mot_he_thong_bao_dong_hoan_chinh_va_manh_me_cho_nhieu_nhu_cau_an_ninh_khac_nhau\" title=\"C\u00f2i b\u00e1o \u0111\u1ed9ng kh\u00f4ng d\u00e2y AL21 kh\u00f4ng ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed9c l\u1eadp m\u00e0 c\u00f2n c\u00f3 th\u1ec3 k\u1ebft n\u1ed1i linh ho\u1ea1t v\u1edbi nhi\u1ec1u thi\u1ebft b\u1ecb c\u1ea3nh b\u00e1o kh\u00f4ng d\u00e2y kh\u00e1c c\u1ee7a Kawasan, t\u1ea1o th\u00e0nh m\u1ed9t h\u1ec7 th\u1ed1ng b\u00e1o \u0111\u1ed9ng ho\u00e0n ch\u1ec9nh v\u00e0 m\u1ea1nh m\u1ebd cho nhi\u1ec1u nhu c\u1ea7u an ninh kh\u00e1c nhau:\">C\u00f2i b\u00e1o \u0111\u1ed9ng kh\u00f4ng d\u00e2y AL21 kh\u00f4ng ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed9c l\u1eadp m\u00e0 c\u00f2n c\u00f3 th\u1ec3 k\u1ebft n\u1ed1i linh ho\u1ea1t v\u1edbi nhi\u1ec1u thi\u1ebft b\u1ecb c\u1ea3nh b\u00e1o kh\u00f4ng d\u00e2y kh\u00e1c c\u1ee7a Kawasan, t\u1ea1o th\u00e0nh m\u1ed9t h\u1ec7 th\u1ed1ng b\u00e1o \u0111\u1ed9ng ho\u00e0n ch\u1ec9nh v\u00e0 m\u1ea1nh m\u1ebd cho nhi\u1ec1u nhu c\u1ea7u an ninh kh\u00e1c nhau:<\/a><\/li><\/ul><\/nav><\/div>\n\n<p><b>The AL21 Wireless Alarm Siren<\/b><span style=\"font-weight: 400;\"> is a versatile security device that can operate independently or work in conjunction with other wireless security devices such as door\/window magnetic sensors, motion detectors, emergency panic buttons, and smoke detectors. With reliable wireless signal transmission and a high alarm sound level of up to 110 dB, the AL21 not only provides effective audible warning but also functions as a <\/span><b>compact wireless alarm control unit<\/b><span style=\"font-weight: 400;\"> , making it ideal for homes, offices, and retail stores.<\/span><\/p>\n<figure style=\"width: 434px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kawasan.vn\/wp-content\/uploads\/2025\/04\/AL21_2018.jpg\" alt=\"C\u00f2i b\u00e1o \u0111\u1ed9ng kh\u00f4ng d\u00e2y AL21\" width=\"434\" height=\"429\" \/><figcaption class=\"wp-caption-text\">The AL21 Wireless Alarm Siren<\/figcaption><\/figure>\n<p><b>KEY FEATURES<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Smart Standalone Alarm Siren<\/b><span style=\"font-weight: 400;\">: Supports wireless connection with up to 50 devices, including door\/window magnetic sensors, motion detectors, emergency panic buttons, smoke detectors, and other compatible wireless devices.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Supports Up to 30 Remote Controls<\/b><span style=\"font-weight: 400;\">: Allows users to remotely arm or disarm the siren using RF remote controls.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>433 MHz Wireless Communication<\/b><span style=\"font-weight: 400;\">: Compatible with PT2262\/PT1527 coding standards, with an effective transmission range of 30\u201340 m in open areas without obstacles.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Adjustable Alarm Volume<\/b><span style=\"font-weight: 400;\">: Press the [SET] button repeatedly to select the appropriate sound level for the installation environment.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Built-in Rechargeable Backup Battery<\/b><span style=\"font-weight: 400;\">: Provides 6\u20138 hours of backup operation during a power outage, helping maintain continuous security protection.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>High Alarm Sound Level of Up to 110 dB<\/b><span style=\"font-weight: 400;\">: Provides a loud and clear warning, suitable for larger areas.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Simple Setup and Easy Operation<\/b><span style=\"font-weight: 400;\">: Pair devices within seconds and clear paired devices using a single button.<\/span><\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/kawasan.vn\/wp-content\/uploads\/2025\/04\/AL21.jpg\" alt=\"\" width=\"400\" height=\"400\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Tuong_thich_linh_hoat_%E2%80%93_Ket_hop_hieu_qua_voi_nhieu_thiet_bi_khac\"><\/span><b>Flexible Compatibility \u2013 Effective Integration with Multiple Devices<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h2><span class=\"ez-toc-section\" id=\"Coi_bao_dong_khong_day_AL21_khong_chi_hoat_dong_doc_lap_ma_con_co_the_ket_noi_linh_hoat_voi_nhieu_thiet_bi_canh_bao_khong_day_khac_cua_Kawasan_tao_thanh_mot_he_thong_bao_dong_hoan_chinh_va_manh_me_cho_nhieu_nhu_cau_an_ninh_khac_nhau\"><\/span><b>The AL21 Wireless Alarm Siren<\/b><span style=\"font-weight: 400;\"> not only operate independently but can also <\/span><b>flexibly connect with various other Kawasan wireless alarm devices<\/b><span style=\"font-weight: 400;\">, to create a <\/span><b>complete and robust alarm system<\/b><span style=\"font-weight: 400;\"> for a wide range of security needs:<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Works with the BK100M wireless emergency panic button<\/span><\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-26316\" src=\"https:\/\/kawasan.vn\/wp-content\/uploads\/2025\/04\/z6866560640317_b2f87d890980028b1261cb2a0d095920.jpg\" alt=\"\" width=\"516\" height=\"516\" \/><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Works with the SB60M \/ SB100M wireless door opening alarm sensors<\/span><\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-26317\" src=\"https:\/\/kawasan.vn\/wp-content\/uploads\/2025\/04\/z6866603051059_88f50c5b9ed6291839ad9efa21707fd0.jpg\" alt=\"\" width=\"539\" height=\"525\" srcset=\"https:\/\/kawasan.vn\/wp-content\/uploads\/2025\/04\/z6866603051059_88f50c5b9ed6291839ad9efa21707fd0.jpg 530w, https:\/\/kawasan.vn\/wp-content\/uploads\/2025\/04\/z6866603051059_88f50c5b9ed6291839ad9efa21707fd0-400x389.jpg 400w\" sizes=\"auto, (max-width: 539px) 100vw, 539px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-26315\" src=\"https:\/\/kawasan.vn\/wp-content\/uploads\/2025\/04\/z6866599495261_c574ed8dab9faa2b05b5af397c51bbe3.jpg\" alt=\"\" width=\"554\" height=\"544\" srcset=\"https:\/\/kawasan.vn\/wp-content\/uploads\/2025\/04\/z6866599495261_c574ed8dab9faa2b05b5af397c51bbe3.jpg 554w, https:\/\/kawasan.vn\/wp-content\/uploads\/2025\/04\/z6866599495261_c574ed8dab9faa2b05b5af397c51bbe3-400x393.jpg 400w\" sizes=\"auto, (max-width: 554px) 100vw, 554px\" \/><\/p>\n<p><b>TECHNICAL SPECIFICATIONS<\/b><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Specifications<\/b><\/td>\n<td><b>Value<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Main Power Supply<\/span><\/td>\n<td><span style=\"font-weight: 400;\">AC 100\u2013220V<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Rechargeable Backup Battery<\/span><\/td>\n<td><span style=\"font-weight: 400;\">3.7 V \u2013 600 mAh (6\u20138 hours of backup operation during power outage)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Operating Frequency<\/span><\/td>\n<td><span style=\"font-weight: 400;\">433 MHz (PT2262\/PT1527 coding standard)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Alarm Sound Level<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Up to 110 dB<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Standby Current<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&lt;20mA<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Alarm Current Consumption<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&lt;200mA<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Maximum Number of Connected Devices<\/span><\/td>\n<td><span style=\"font-weight: 400;\">50 sensors + 30 remote controls<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Alarm Siren Duration<\/span><\/td>\n<td><span style=\"font-weight: 400;\">5 minutes<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Wireless Transmission Range<\/span><\/td>\n<td><span style=\"font-weight: 400;\">30\u201340 m (open area without obstacles)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Volume Adjustment<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Yes \u2013 press the [SET] button<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p><b>QUICK SETUP GUIDE<\/b><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Pairing sensors\/remotes with the siren<\/b>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Slide the power switch to the ON position.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Press and hold the [SET] button for 6 seconds until the LED indicator lights up.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Trigger the sensor or remote control to transmit its code. If pairing is successful, the siren will emit a \u201cbeep\u201d.<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Clearing all paired devices<\/b>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Press and hold the [SET] button for 6 seconds until the LED indicator lights up \u2192 continue with a second long press until the siren emits 6 \u201cbeeps\u201d.<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Adjusting the volume<\/b>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Press the [SET] button repeatedly to cycle through the available volume levels.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p><b>PRACTICAL APPLICATIONS<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Houses, condominiums, and studio apartments<\/span><\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-26318\" src=\"https:\/\/kawasan.vn\/wp-content\/uploads\/2025\/04\/screenshot_1754129515.png\" alt=\"\" width=\"366\" height=\"389\" \/><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Retail stores, showrooms, jewelry stores, and pharmacies<\/span><\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-26319\" src=\"https:\/\/kawasan.vn\/wp-content\/uploads\/2025\/04\/screenshot_1754129506.png\" alt=\"\" width=\"563\" height=\"349\" srcset=\"https:\/\/kawasan.vn\/wp-content\/uploads\/2025\/04\/screenshot_1754129506.png 563w, https:\/\/kawasan.vn\/wp-content\/uploads\/2025\/04\/screenshot_1754129506-400x248.png 400w\" sizes=\"auto, (max-width: 563px) 100vw, 563px\" \/><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Small offices and warehouses<\/span><\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-26320\" src=\"https:\/\/kawasan.vn\/wp-content\/uploads\/2025\/04\/screenshot_1754129526.png\" alt=\"\" width=\"546\" height=\"371\" srcset=\"https:\/\/kawasan.vn\/wp-content\/uploads\/2025\/04\/screenshot_1754129526.png 518w, https:\/\/kawasan.vn\/wp-content\/uploads\/2025\/04\/screenshot_1754129526-400x272.png 400w\" sizes=\"auto, (max-width: 546px) 100vw, 546px\" \/><\/p>\n<p><b>SAFE \u2013 FLEXIBLE \u2013 EASY TO USE<\/b><\/p>\n<p><b>AL21 Alarm Siren<\/b><span style=\"font-weight: 400;\"> is an effective solution for users who need a simple and reliable alarm system. No complicated wiring or large alarm control panel is required. With one AL21 siren and several compatible wireless door sensors, users can quickly build a complete security alarm system for their home.<\/span><\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>GI\u1edaI THI\u1ec6U S\u1ea2N PH\u1ea8M C\u00f2i b\u00e1o \u0111\u1ed9ng kh\u00f4ng d\u00e2y AL21 l\u00e0 thi\u1ebft b\u1ecb an ninh \u0111a n\u0103ng, ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed9c l\u1eadp ho\u1eb7c k\u1ebft h\u1ee3p v\u1edbi c\u00e1c c\u1ea3m bi\u1ebfn kh\u00f4ng d\u00e2y kh\u00e1c nh\u01b0: c\u1eeda t\u1eeb, \u0111\u1ea7u d\u00f2 chuy\u1ec3n \u0111\u1ed9ng, n\u00fat b\u00e1o kh\u1ea9n, b\u00e1o kh\u00f3i&#8230; S\u1edf h\u1eefu kh\u1ea3 n\u0103ng ph\u00e1t t\u00edn hi\u1ec7u m\u1ea1nh, \u00e2m l\u01b0\u1ee3ng l\u1edbn l\u00ean [&hellip;]<\/p>","protected":false},"featured_media":16876,"comment_status":"open","ping_status":"closed","template":"","meta":{"_yoast_wpseo_focuskw":"C\u00d2I B\u00c1O \u0110\u1ed8NG KH\u00d4NG D\u00c2Y","_yoast_wpseo_metadesc":"C\u00f2i b\u00e1o \u0111\u1ed9ng kh\u00f4ng d\u00e2y AL21 l\u00e0 thi\u1ebft b\u1ecb an ninh \u0111a n\u0103ng, ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed9c l\u1eadp ho\u1eb7c k\u1ebft h\u1ee3p v\u1edbi c\u00e1c c\u1ea3m bi\u1ebfn kh\u00f4ng d\u00e2y kh\u00e1c nh\u01b0: c\u1eeda t\u1eeb, \u0111\u1ea7u d\u00f2 chuy\u1ec3n \u0111\u1ed9ng, n\u00fat b\u00e1o kh\u1ea9n, b\u00e1o kh\u00f3i...","_yoast_wpseo_focuskeywords":"","_yoast_wpseo_keyword_synonyms":""},"product_cat":[500],"product_tag":[],"class_list":["post-23013","product","type-product","status-publish","has-post-thumbnail","hentry","product_cat-coi-bao-dong-khong-day"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.9 (Yoast SEO v24.9) - 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