Help needed in determining what detector this is

[alarmconfused]

Hello,

Can anyone please tell me what detector this (Plate picture) could be? We have several plates on the walls of the apartment + a smoke alarm unit. One of these plates started making a loud annoying noise through vibrations.

Thanks!

 

[ActionDave]

I am closing this thread, in accordance with the Forum rules. This Forum is intended to assist professional electricians, inspectors, engineers, and other members of the electrical industry in the performance of their job-related tasks. However, if you are not an electrician or an electrical contractor, then we are not permitted to help you perform your own electrical installation work.