Hawking HomeRemote Pro HRDS1 Door/Window Sensor Measures 4.75 x 1.2 x 0.75 inches(LxWxH) Includes 3 AAA batteries and a mounting kit Receive text message or email alerts when a door or window is opened, set lights to turn on with activity Door/window sensor for use with HomeRemote Pro Home Control and Remote Monitoring System Easy plug and play installation Door/window sensor for use with HomeRemote Pro Home Control and Remote Monitoring System Receive text message or email alerts when a door or window is opened; set lights to turn on with activity Easy plug and play installation Includes 3 AAA batteries and a mounting kit Measures 4.75 x 1.2 x 0.75 inches(LxWxH)