• Instead of using a battery, the button transmitter converts kinetic energy into electrical energy and sends a signal when pressed. No need to worry if the battery has power, so you won't miss important visitors
• It also has 38 kinds of ringtones for you to choose from, you can select the music you want according to your preference
• The button transmitter is waterproof, making it strong enough to withstand extreme weather environments
• Easy to install. Just plug the receiver into a socket, and mount the button transmitter on the wall or anywhere you want
• Suitable for home, townhouse, apartment, office, school, hospital, hotel, etc

Specification:

• Operating voltage: AC 100V-230V 50/60Hz
• Operating frequency: 433.92MHz
• Standby power consumption: 0.25W
• Music: 38 kinds of ringtones
• Controllable volume: ≥50dB/1m
• Receiving distance: ≥150 m (barrier free space)
• Receiver operating temperature: -10℃ ~ 45℃
• Transmitter operating temperature: -20℃ ~ 60℃
• Receiver size: 66*50*55mm
• Transmitter size: 70*46*23mm