Elpa Wireless Chime Motion Sensor Transmitter Set

This wireless chime system is easy to install with no wiring required! You can add transmitters and receivers as needed (up to 8 transmitters can be registered to one receiver). The transmission range is approximately 120m, making it ideal for homes, stores, and offices. With about 250,000 ID codes, there's no worry of interference. The receiver and transmitter notify you when it's time to replace the batteries. Choose from 20 different chime sounds, which can be set differently for each transmitter. The sensor sends a signal when it detects motion, alerting you through the receiver.