If it is hard-wired usually you have to replace all alarms with

来源: borisg 于 2017-01-14 11:09:13 [] [博客] [旧帖] [给我悄悄话] 阅读数 : 0 (0 bytes)

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• otherwise the alarms MAY NOT WORK IN CASE OF FIRE. -borisg- ♂ 给 borisg 发送悄悄话 borisg 的博客首页 (0 bytes) () 01/14/2017 postreply 11:12:38

• 是的，准备全换，买了6个，想着自己装，不知行否 -hz82000- ♀ 给 hz82000 发送悄悄话 hz82000 的博客首页 (0 bytes) () 01/14/2017 postreply 11:49:48

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