Features:
Wireless door chime is great for retail store， shops， business， salons， front / back / side door， etc.
Attach this infrared alarm anywhere you want and instantly know when someone crosses the beam.
Infrared sensor detects motion and sends a signal to the receiver.
The chime is loud and clear.
Infrared sensor detects motion and sends a signal to the receiver
Wireless installation， just place the sensor at the entrance

Specifications:
Working Range: Up to 100 meters / 328 feet between receiver and transmitter(space without obstacles)
Transmitter Size (L x W x H): Approx. 6*4.8*9cm
Receiver Size (L x W x H): Approx. 6.8*3.3*9.2cm
Transmitter voltage: DC 3V
Receiver voltage: DC 9V
Frequency: 315 MHz
Material: Plastic
Color: White

Package Content:
1 x Transmitter(Batteries are not included)
2 x Receiver(Batteries are not included)