Highlighted here is a wireless doorbell with battery-free operation. It includes a self-powered button and offers 25 polyphony ring tones for the users to choose form. This wireless doorbell is easy to install and has a working range of 110 meters.

• Include a chime (receiver) and a button (transmitter).
• Power supply: AC 100V~240V; self-powered.
• Operating temperature: -10℃~+50℃; 20℃~+50℃.
• Range (open field): 110 meters.
• RF frequency: 433MHz.
• Sound level: 80dB@ 3ft (1m).
• Power consumption: 200mW.
• Waterproof: yes.
• Indicator color: blue.
• Operating forces: 10N.
• Ring tone: 25 polyphony ring tones.
• Battery-free operation. 
• Self-powered button. 
• Easy to install. 
• Sleek and functional design.
• Weight: 65g, 55g.