哪种烟雾报警器好? AC wired or battery based

[shanghaigirl]

Thanks

 

[case]

The best one is AC wired with battery backup. The battery based is easy to install .
But with code, in the new house, all the fire alarm must be connected together. So that if one is tricked, all should be sounded.

 

[john19]

RONA这个星期AC wired 降价。