[3 Alert & 38 to From]: You can select 1 of of being alerted (Sound/LED Flash/Sound and LED Flash) and 3 volume levels from 25-80dB. You can also select from 38 Ringtones with LED Light. [Wireless Plug-in Receiver]: The portable wireless plug-in receiver plugs into any standard outlet. The sensor uses 3 AAA batteries (Not Included). Infrared sensor detects motion and sends a signal to the receiver. Detection time delay in between motion sensor alerts is configurable from 15 seconds to , just place the sensor at the entrance to your driveway and the receiver inside your home. [Long Distance Wireless]: Working range up to 328 feet (100 ) between receiver and transmitter allowing you to place it a good distance. It can be alerted to visitors, notice door opening, scare off unwanted intruders, or even know when your children have accessed restricted areas. [Easy and Fast Installation]: This monitor system is fully-expandable, with plug-and-play sensors that can be set up within minutes. The sensors can be mounted to walls, fence posts, trees, or any other surface, for full coverage of your property. [Wide Range of Uses]: perfect for front doors, hallway, frames, driveways, walking paths, and anywhere in your home you to be alerted to motion. Also great to alert business owners that are working in the back, or out of sight, to customers entering their .Please note that this not waterproof. Keep it from or cover adequately. Plug Type:US Plug,it applies to Canada, ,Mexico, Thailand, the , the Philippines,Taiwan and so on. Material:plastic colour:White Package Contents: 1 x Receiver 2 x PIR Sensor Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store