About this item:
 
White polishing housing. Weight:25g, Dimensions: 59.8mm x 23mm x12.7mm (Part A). 40 mm x10mm x 12.56mm (Part B).

5 x sensors for door, windows or any open/close unit.

Battery Powered. Average battery span for replacement 12-15 months. You will recieve low battery warning each time on your smart home panel.