If it is hard-wired usually you have to replace all alarms with
所有跟帖:
• otherwise the alarms MAY NOT WORK IN CASE OF FIRE. -borisg- ♂ (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- ♀ (0 bytes) () 01/14/2017 postreply 11:49:48