Features:

New and high quality 
Easy to install 
powered by 2 pieces AAA 1.5V batteries  (not included) 
Protect your home or office 

Specifications: 
Material: Plastic & Electronic Parts 
Color: White 
Volume: 90db 
Net weight: about 35g
Note:
Place the cover in place. 
Has a convenient On / Off switch, so you can set the alarm to Off when you do not want to use it.