Smart Motion Sensor Alarm Wireless Doorbell Plug-In Doorbell Home Security Infrared Detector Alarm Kit with 2 PIR Sensors 1 Receiver 38 Chimes LED Indicator White Features: An infrared sensor detects motion and sends a signal to a receiver. Switch between 38 chimes with bright LED lights. The portable wireless plug-in receiver plugs into any standard outlet. The sensor can be mounted on the wall. The working range between the receiver and the sensor is up to 300 feet (70 meters), allowing you to place it alone over long distances. Ideal for front doors, window frames, driveways, sidewalks, and anywhere in your home where you would like to receive motion alerts. Great for alerting store owners who are working in the back or out of sight when customers enter their store. Specification: Receiver working voltage: AC 110V-240V PIR sensor operating voltage: 4.5V Batteries for PIR Sensor: 3 * AAA Batteries (Remarks) Music: 38 different songs are optional Working range: up to 70 meters Infrared sensing distance: 3-7 meters Receiver size: 8.0*7.6*3.3cm/ Receiver Weight: Approx. 62g / 2.18oz PIR sensor size: 8.0 * 5.9 * 4.5cm / PIR Sensor Weight: Approx. 46g / 1.62oz Package size: about 14.2 * 9 * 8.7 cm / 12.36 * 8.66 * 4.88 inches Package Weight: Approx. 227g / 8.00oz packing list: 2 * PIR sensor 1 * Receiver