BeGrit Wireless Home Security Driveway Alarm, 1 Receiver and 1 PIR Motion Sensor Detector with 1 Plug Adapter Alert System Kit Ultimate wireless alert system, fulfill all kinds of security alert needs in your house, office, or any other property. 250 feet range between the sensor and receiver Simple security alert system, plug and play, no need to set up or wire work Multi-function alert system; Sends alert when people, vehicles enter driveway or approach mailbox; or intruder open your window or doors; or someone push the wireless emergency button Flexible extendibility system - If you have more than one driveway, or area you would like to set up, you could extend the alert system with up to 6 sensors max Proper chime sound (85dB), never too much noise to bother yourself or your neighborhood