Easy, quick, wireless installation: Infrared sensor detects motion and sends a signal to the receiver. Choose from 38 ringtones with bright LED light. Wall-mounted sensor. Wireless plug-in receiver: The portable wireless plug-in receiver plugs into any standard outlet. The sensor uses 3 AAA batteries (not included). Delay between motion sensor alerts is configurable from 15 seconds to 30 seconds, simply place the sensor at the entrance to your driveway and the receiver inside your home. Range up to 328 feet (100 meters) between receiver and transmitter allows you to place it a good distance from the car to alert you of the arrival and departure of family members, unwanted guests or solicitors, or any visitors to your home or business. Ideal for front doors, window frames, driveways, hallways, and anywhere in the house you want to be alerted to motion. Also great for alerting business owners who work in the back, or out of sight, to customers entering their store. Note: Includes 2 plug-in receivers and 1 motion detector requiring 3 AAA batteries (not included). Receiver Size: 8cm L x 7.6cm W x 3.3cm H (80 x 76 x 33mm) Sensor Size: 8cm L x 5.9cm W x 4.5cm H (80 x 59 x 45mm) . Specifications: Receiver Working Voltage: 110V-240V PIR Sensor Working Voltage: (3 AAA batteries) operation Working Range: Up to 328 feet (100 meters) Infrared Detection Radius: Up to 23 feet (7 meters) Receiver Size: 8cm L x 7.6cm W x 3.3cm H (80 x 76 x 33mm) Sensor Size: 8cm L x 5.9cm W x 4.5 cm H (80 x 59 x 45 mm) Package Weight: 220 gram (.22 kgs) Receiver Switch Settings: Music Source: 38 different songs Volume Adjustment: High, Medium, Low Package Contents: 1 x PIR Sensor (3 x AAA batteries, not included) 2 x Receiver Note: Other items are not included, the color is based on the first picture, and the other pictures only show the effect. Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you! becomeveryrich