Feature: 1. Special Design: Wireless home alarm security system, unique design, the signal is sent to the receiver, it sounds like a remote doorbell. 2. Infrared Sensor: The infrared sensor detects the movement and sends a signal to the receiver. Just place the sensor at the entrance of the driveway and the receiver is at home. 3. Wireless: The motion detector is installed wirelessly, you only need to place the sensor at the entrance, and immediately remind you when someone enters your home. 4. Welcome Reminding: The motion sensor sends an audible ringtone to remind you that someone is approaching. It is also very suitable for business owners to remind customers who are out of sight to enter their store. 5. Easy to Operate: The motion sensor is simple to operate, do whatever you want, and keep a good distance from the receiver to remind you of the arrival and departure of your family. Specification: Item Type: Driveway Alarm Material: ABS Uses: Homes, shopping malls, supermarkets, shops Sensor Battery: 2 x AA batteries (without battery) Receiver Battery: 1 x 9V laminated battery (without battery) Transmitting Distance: Approx. 100m/ 109.36yd (in an open, unobstructed, and undisturbed environment)Infrared Sensing Distance: Approx.3-7m/ 3.28-7.66yd Music Ringtones: Classic singles (For Elise). Package List: 1 x Infrared Transmitter1 x Doorbell Receiver1 x Manual2 x Bracket Accessory