Protect your home and scare off potential intruders. Open windows with the deactivation key inserted, and the alarm won't go off. Once the deactivation key has been removed, should the door or window open, the alarm will sound until the key is reinserted, or the door or window is closed. Fast, simple wireless installation with a loud, 105db warning alarm. Dimensions: 3"L x 2"W x 0.5"H. Weight: 0.15 oz.