Widely UsedGreat for front doors, window frames, driveways, walkways, and anywhere around the home you want to be alerted. Also great for alerting business owners working in the back or out of sight, to customers entering their store. Multifunctional Chess Set Game . Wireless Plug-in ReceiverPortable plug-in receiver plugs into any standard outlet. The sensor uses 3 AAA batteries (not included). The detection delay between motion sensor alerts is configurable from 30 seconds. Simply place the sensor at the entrance of your driveway and the receiver inside your home. Wide Working RangesWorking ranges of up to 230 feet (70 meters) between the receiver and transmitter allow you to place it at a good distance from the receiver to alert you of the arrival and departure of family members, unwanted solicitors or lawyers, or anyone visiting your home or business Wireless InstallationThe sensor is wall mountable, no worry about the installation problem. Easy and QuickThe infrared sensor detects motion and sends a signal to the receiver. Choose from 38 ringtones with bright LED light. Specifications: Material: Plastic shell Working range: Up to 70 meters Infrared sensing distance: 3-7 meters Receiver control button: Music source: 38 different songs Volume adjustment: high, medium, low (60~105dB) Voice: Can be adjusted with light and voice / with light and no voice Model: 1 transmitter and 2 receivers, 1 transmitter and 2 receivers, Transmitter: Approx. 80 * 59 * 45mm/3.15 * 2.32 * 1.77 inch Receiver: Approx. 76 * 80 * 33mm/2.99*3.15*1.30inch Weight: Approx. 226-237g Package Includes: 2 x Transmitter 1 x Receiver 2 x Screws 2 x Expansion Tube 2 x Accessories