Wireless Motion Sensor Alarm Includes 1 receivers and 2 transmitters, with 3-7m/ 9.8-22.9ft effective detection range, 120 detection angle, can effectively detect movement in surrounding areas and trigger alert to the linked receiver. Large Wireless Transmission DistanceSignals with b penetration force can be sent to the receiver more than 200m/ 656ft away to warn you, providing security for your property and loved ones. IP52 WaterproofWith large waterproof cover and deepened groove, no fear of rainy days, suitable for outdoor use, widely applied in front doors, window frames, driveways, walking paths, shops, garage, and more. 38 Chimes OptionalThere is always one chime you and your family love; with built-in high-quality speaker, low power consumption, 4 levels of adjustable volume, no worry of that you can't hear the ringing. Power SupplyThe receiver can be easily plugged into a standard outlet inside your home, and the transmitters are powered by 3 * AAA batteries not included, convenient for placing them at the entrance to your driveway. Specifications: Color: Black Material: ABS Detection Angle: 120° Detection Range: 3-7m Transmission Range: 200m without obstacles Frequency: 433MHz Ringing Tones: 38