YisTech Wireless portable motion sensor include 1 Motion Sensor and 1 Portable receiver. The motion sensor will alerted when people enter or leave.Use as Entry Alert for home/Business.It also can be used at the front door, back door, mailbox, garage and driveway.This motion sensor is not waterproof.If used it on outdoor,Please use on a covered porch or other location where it wouldn't get wet. [Wide Distance and range]：Motion Detector Security Sensor detects movement within 16.4ft range x 110°. It transmits the signal to receivers within the 500ft/150m in open area. It with optional adjustable mounting bracket. [Visual and Sound Alerts]: When the sensor is engaged, the LED light indicator flashes to perform a visual alert. It's a great visual indicator when you are listening to music or for the hearing impaired. [Multiple melodies&Loud chime]:The receiver has 58 ringtones for your choice. 5 adjustable volume levels from 0 dB to 110 dB. [Easy Installation]: This Wireless Monitor Sensor is battery (also can use USB cable) operated for fast and easy use. Each receiver can be paired with up to 20 transmitters. Each transmitter can be paired with up to 20 receivers. , Manufacturer: Shenzhen shenan yangguang Electronics Co.,Ltd