Infrared Motion Sensor Doorbell

EASY, FAST, WIRE-FREE INSTALLATION: the sensor detects motion and sends a signal to the receiver. More than 1 transmitter SKU is optional.SELECTABLE RINGTONES: the receiver is a doorbell design with 36 different ringtones from melody sounds to simple basic buzz for personal preferences and 5 welcome songs for retail business use.WIDE RANGE: The transmission range of the driveway alarm is up to 918ft (the distance from the detector to the receiver) and the detection range of the infrared sensor is approximately 13-26ft to keep you informed and safe. You can put the motion sensor detector at the room of Alzheimer's sleepwalking elderly and put the receiver in your house. SPECIFICATIONS Volume: 0-110db Use of premises: Home office villa hospital school factory store Type: Doorbells Receiving distance: 280M Remote (in open area) Power Source: Battery, AC Infrared motion sensor power supply: 3*AAA alkaline battery(battery not included) Doorbell Type: Wireless DIY Supplies: Electrical