• Operating range up to 150m in an open area when there are no obstructions
• 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
• The receiver has 5 levels adjustable volume, which can be adjusted to flash only
• It also has 60 ringtones for you to choose from, you can select the music you want according to your preference
• The transmitter can work normally in snow or high temperature environment, waterproof and dust-proof
• Easy to install. Just plug the receiver into a socket, and mount the button transmitter on the wall or anywhere you want
• Suitable for any home, townhouse, apartment, office, school, hospital, hotel, etc

Specification:

• Music: 60 chimes 
• Volume: 5 levels
• Transmitter: no battery required, press to generate electricity
• Receiver: plug into the power socket (110V-220V)
• Transmitter size: 77mm*46mm*21mm
• Receiver size: 90mm*56mm*29mm
• Remote distance: 150m (straight line distance on open area)