1.[Weatherproof Design]Engineered to withstand harsh weather,wireless driveway alarm is dustproof and waterproof. making it ideal suitable for homes, schools, offices, and more. 2.[Convenient Wireless Operation]The receiver is directly plugged into the socket or connected to the USB interface, the setting buttons can be used normally, and the transmitter can use 3 AAAbatteries(not included). 3.[Customizable Alerts & Sounds]Choose from 38 different chimes at three volume levels, allowing you to personalize how you're notified based on your environment and preference. 4.[Ef suitable fortless Installation]This expandable monitor system in minutes with plug-and-play sensors.This flexibility ensures coverage. 5.[Extensive Coverage]The motion sensor ensures wide area coverage and penetrates thick walls, trees, and metal sidings without interference from other devices. It's designed to alert you of any visitors, ensuring you never miss an important guest or delivery. Receiver size: 8 x 7.6 x 3.3cm Sensor Size: 9 x 8 x 5.3cm Specification: Type: Driveway Alarm Sensor Battery: AAA battery x 3 ((Not Included) Plug Type:UK plug,it applies to Malaysia, the United Kingdom and so on. Voltage: AC110-240V Colour: Black Material: ABS Package Contents: 1 x Sensor 1 x Receiver 1 x English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.