一氧化氮报警器。Beeps once every a while, how to stop it

Tenant calls me about this. I do not have owner manual any more. 

 

所有跟帖： 

• 一氧化碳， 该换电池了吧？ -uuyyjj- ♀ (0 bytes) () 05/04/2016 postreply 11:35:12

• 需要换电池了 -柠檬椰子汁- ♂ (44 bytes) () 05/04/2016 postreply 11:44:16

• 电池快没电了 -Versailles- ♂ (0 bytes) () 05/04/2016 postreply 12:41:23

• it is hard-wired. not on battery -君临萌萌哒- ♂ (0 bytes) () 05/04/2016 postreply 15:19:18

• 可能有Backup battery，另一个简单，坏了 -soccer88- ♂ (0 bytes) () 05/04/2016 postreply 15:22:10

• i will try to open it without break it. :) -君临萌萌哒- ♂ (0 bytes) () 05/04/2016 postreply 15:23:39

• hard wired still has a backup battery -雪花无声- ♀ (0 bytes) () 05/04/2016 postreply 16:29:46