{"id":29909,"date":"2026-01-12T10:48:32","date_gmt":"2026-01-12T03:48:32","guid":{"rendered":"https:\/\/kawasan.vn\/?post_type=product&#038;p=29909"},"modified":"2026-01-12T10:50:02","modified_gmt":"2026-01-12T03:50:02","slug":"dau-phat-chuong-khong-day-kawasan-b81a","status":"publish","type":"product","link":"https:\/\/kawasan.vn\/en\/product\/dau-phat-chuong-khong-day-kawasan-b81a\/","title":{"rendered":"\u0110\u1ea6U PH\u00c1T CHU\u00d4NG KH\u00d4NG D\u00c2Y KAWASAN B81A"},"content":{"rendered":"<h2 data-start=\"1771\" data-end=\"1795\"><span class=\"ez-toc-section\" id=\"Gioi_thieu_san_pham\"><\/span>Gi\u1edbi thi\u1ec7u s\u1ea3n ph\u1ea9m<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\/dau-phat-chuong-khong-day-kawasan-b81a\/#Gioi_thieu_san_pham\" title=\"Gi\u1edbi thi\u1ec7u s\u1ea3n ph\u1ea9m\">Gi\u1edbi thi\u1ec7u s\u1ea3n ph\u1ea9m<\/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\/dau-phat-chuong-khong-day-kawasan-b81a\/#Nguyen_ly_hoat_dong\" title=\"Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng\">Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng<\/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\/dau-phat-chuong-khong-day-kawasan-b81a\/#Tinh_nang_va_dac_diem\" title=\"T\u00ednh n\u0103ng v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m\">T\u00ednh n\u0103ng v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kawasan.vn\/en\/product\/dau-phat-chuong-khong-day-kawasan-b81a\/#Thong_so_ky_thuat\" title=\"Specifications\">Specifications<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kawasan.vn\/en\/product\/dau-phat-chuong-khong-day-kawasan-b81a\/#Ung_dung\" title=\"\u1ee8ng d\u1ee5ng\">\u1ee8ng d\u1ee5ng<\/a><\/li><\/ul><\/nav><\/div>\n\n<p data-start=\"1796\" data-end=\"2049\"><strong data-start=\"1796\" data-end=\"1804\">B81A<\/strong> l\u00e0 \u0111\u1ea7u ph\u00e1t chu\u00f4ng kh\u00f4ng d\u00e2y s\u1eed d\u1ee5ng ngu\u1ed3n \u0111i\u1ec7n tr\u1ef1c ti\u1ebfp 220V\u2013240V, \u0111\u00f3ng vai tr\u00f2 nh\u1eadn t\u00edn hi\u1ec7u t\u1eeb n\u00fat nh\u1ea5n kh\u00f4ng pin D81A v\u00e0 ph\u00e1t \u00e2m thanh b\u00e1o kh\u00e1ch. Thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 l\u1eafp \u0111\u1eb7t trong nh\u00e0, ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh li\u00ean t\u1ee5c, kh\u00f4ng ph\u1ee5 thu\u1ed9c pin.<\/p>\n<h2 data-start=\"2051\" data-end=\"2075\"><span class=\"ez-toc-section\" id=\"Nguyen_ly_hoat_dong\"><\/span>Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"2076\" data-end=\"2251\">B81A nh\u1eadn t\u00edn hi\u1ec7u kh\u00f4ng d\u00e2y RF t\u1eeb n\u00fat nh\u1ea5n D81A v\u00e0 ph\u00e1t \u00e2m thanh chu\u00f4ng ngay l\u1eadp t\u1ee9c. Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 t\u00f9y ch\u1ec9nh ki\u1ec3u chu\u00f4ng v\u00e0 \u00e2m l\u01b0\u1ee3ng ph\u00f9 h\u1ee3p v\u1edbi t\u1eebng kh\u00f4ng gian s\u1eed d\u1ee5ng.<\/p>\n<h2 data-start=\"2253\" data-end=\"2279\"><span class=\"ez-toc-section\" id=\"Tinh_nang_va_dac_diem\"><\/span>T\u00ednh n\u0103ng v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li data-start=\"2282\" data-end=\"2332\">S\u1eed d\u1ee5ng ngu\u1ed3n \u0111i\u1ec7n tr\u1ef1c ti\u1ebfp 220V, kh\u00f4ng c\u1ea7n pin<\/li>\n<li data-start=\"2335\" data-end=\"2389\">Nh\u1eadn t\u00edn hi\u1ec7u nhanh v\u00e0 \u1ed5n \u0111\u1ecbnh t\u1eeb n\u00fat nh\u1ea5n kh\u00f4ng pin<\/li>\n<li data-start=\"2392\" data-end=\"2428\">H\u1ed7 tr\u1ee3 nhi\u1ec1u ki\u1ec3u chu\u00f4ng kh\u00e1c nhau<\/li>\n<li data-start=\"2431\" data-end=\"2469\">C\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh \u00e2m l\u01b0\u1ee3ng linh ho\u1ea1t<\/li>\n<li data-start=\"2472\" data-end=\"2499\">\u00c2m thanh r\u00f5 r\u00e0ng, d\u1ec5 nghe<\/li>\n<li data-start=\"2502\" data-end=\"2554\">Thi\u1ebft k\u1ebf g\u1ecdn g\u00e0ng, ph\u00f9 h\u1ee3p nhi\u1ec1u kh\u00f4ng gian n\u1ed9i th\u1ea5t<\/li>\n<\/ul>\n<h2 data-start=\"2556\" data-end=\"2578\"><span class=\"ez-toc-section\" id=\"Thong_so_ky_thuat\"><\/span>Specifications<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li data-start=\"2581\" data-end=\"2618\">Ngu\u1ed3n \u0111i\u1ec7n: 220V \u2013 240V AC, 50\/60Hz<\/li>\n<li data-start=\"2621\" data-end=\"2649\">Ki\u1ec3u k\u1ebft n\u1ed1i: Kh\u00f4ng d\u00e2y RF<\/li>\n<li data-start=\"2652\" data-end=\"2703\">\u00c2m l\u01b0\u1ee3ng: C\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh (t\u1ed1i \u0111a kho\u1ea3ng 70 dB)<\/li>\n<li data-start=\"2706\" data-end=\"2773\">Kho\u1ea3ng c\u00e1ch nh\u1eadn t\u00edn hi\u1ec7u: kho\u1ea3ng 30\u201380 m (t\u00f9y \u0111i\u1ec1u ki\u1ec7n th\u1ef1c t\u1ebf)<\/li>\n<li data-start=\"2776\" data-end=\"2816\">Chu\u1ea9n b\u1ea3o v\u1ec7: IP20 (s\u1eed d\u1ee5ng trong nh\u00e0)<\/li>\n<li data-start=\"2819\" data-end=\"2843\">Ch\u1ea5t li\u1ec7u v\u1ecf: Nh\u1ef1a ABS<\/li>\n<li data-start=\"2846\" data-end=\"2862\">M\u00e0u s\u1eafc: Tr\u1eafng<\/li>\n<\/ul>\n<h2 data-start=\"2864\" data-end=\"2877\"><span class=\"ez-toc-section\" id=\"Ung_dung\"><\/span>\u1ee8ng d\u1ee5ng<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li data-start=\"2880\" data-end=\"2895\">Nh\u00e0 \u1edf, c\u0103n h\u1ed9<\/li>\n<li data-start=\"2898\" data-end=\"2918\">V\u0103n ph\u00f2ng l\u00e0m vi\u1ec7c<\/li>\n<li data-start=\"2921\" data-end=\"2944\">C\u1eeda h\u00e0ng, qu\u1ea7y l\u1ec5 t\u00e2n<\/li>\n<li data-start=\"2947\" data-end=\"2972\">Nh\u00e0 tr\u1ecd, ph\u00f2ng cho thu\u00ea<\/li>\n<li data-start=\"2975\" data-end=\"3032\">Thay th\u1ebf \u0111\u1ea7u chu\u00f4ng trong c\u00e1c b\u1ed9 chu\u00f4ng kh\u00f4ng d\u00e2y Kawasan<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Gi\u1edbi thi\u1ec7u s\u1ea3n ph\u1ea9m B81A l\u00e0 \u0111\u1ea7u ph\u00e1t chu\u00f4ng kh\u00f4ng d\u00e2y s\u1eed d\u1ee5ng ngu\u1ed3n \u0111i\u1ec7n tr\u1ef1c ti\u1ebfp 220V\u2013240V, \u0111\u00f3ng vai tr\u00f2 nh\u1eadn t\u00edn hi\u1ec7u t\u1eeb n\u00fat nh\u1ea5n kh\u00f4ng pin D81A v\u00e0 ph\u00e1t \u00e2m thanh b\u00e1o kh\u00e1ch. 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