[Wireless Motion Sensor Alarm] Includes 1 receiver and 2 transmitters, with a 3-7m (9.8-22.9ft) effective detection range and 120-degree detection angle. It can effectively detect movement in surrounding areas and trigger an alert to the linked receiver. [Long Wireless Transmission Distance] Signals with strong penetration can be sent to the receiver from over 200m (656ft) away, providing security for your property and loved ones. [IP52 Waterproof] Designed with a waterproof cover and deepened groove, it is resistant to rain and suitable for outdoor use. Ideal for front doors, window frames, driveways, walkways, shops, garages, and more. [38 Chime Options] Choose from 38 different chime tones; features a built-in high-quality speaker with low power consumption and 4 levels of adjustable volume, ensuring you wont miss the alert. [Power Supply] The receiver plugs into a standard indoor outlet, while the transmitters are powered by 3 x AAA batteries (not included), allowing flexible placement at your driveway entrance or other areas. Specifications: Color: Black Material: ABS Detection Angle: 120 degrees Detection Range: 3-7m Transmission Range: >200m (open area, no obstacles) Frequency: 433MHz Ringing Tones: 38 Power Supply Receiver: AC 110-240V plug Power Supply Transmitter: 3 x AAA batteries (not included) Transmitter Size: 8.5 x 8 x 2cm / 3.3 x 3.1 x 0.78 inch Receiver Size: 8 x 8 x 5.5cm / 3.1 x 3.1 x 2.1 inch Package List: 2 x Transmitter 1 x Receiver Product from NIUNIU's store