• Crafted from high-quality material, ensuring reliable performance
• Provides 38 kinds of ringtones and 3 levels of volumes for you to choose from, you can select the music you want according to your preference
• Easy to install. Just plug the receiver into a USB port, and mount the button transmitter on the wall, door or anywhere you want
• Great for large houses, apartments, offices, classroom, etc

Specification:

• Operating voltage: 5V (USB power supply)
• Power consumption: ≤0.25W
• Operating frequency: 433.92MHz
• Operating temperature: -10℃~45℃
• Controllable volume: ≥50dB/1m
• Remote control distance: ≥150m (open space)
• USB receiver size: L43xW41xH32mm
• Transmitter battery: 23A 12V 60mAh battery (2pcs: totally 120mAh)
• Transmitter power consumption: <10mW
• Transmitter size: L80xW45xH16mm