About This Motion Sensor detects movement within 16.4ft range x 110°. It can be mounted to the wall/by doorways or floor.Easy to monitor loved ones getting out of bed or leaving the room. Portable Receiver include 3*AAA batteries. It can be put in Pocket.Removes alarm noise from bedside. Allows caregiver freely monitor movement remotely. Working range of Motion sensors and Pagers is Up to 260 ft/100 m in open area.Within 260 ft/100 m (in open area),the motion sensor can trigger the receiver to emit a sound to remind the caregiver. The battery receiver has 52 ringtones, 5 Level Adjustable Volume from 0db to 110db. This bed sensor alarm and fall prevention system supports pairing between multiple receivers and transmitters; you can set the kits according to you needs. Overview Color : white Brand : EverNary Power Source : Battery Powered Compatible Devices : Motion Detector Battery Description : AAA