The HOMESAFE Wireless Home Security Motion Sensor is designed to detect motion within a range of up to 8 meters and has a motion detection angle of 110 degrees. It operates using a wireless radio frequency with a range of 300 feet. When motion is detected, the sensor sends a signal to activate the alarm. Please note that this device requires one 9-volt battery, which is not included. With this motion sensor, you can easily protect every window and door in your home.