Self-generating Christmas Doorbell Home Waterproof Battery-free Wireless Doorbell Through Wall Elderly Pager With 38 Ringtones Self-generating Christmas Doorbell Home Waterproof Battery-free Wireless Doorbell Through Wall Elderly Pager With 38 Ringtones Feature: Color: 1111MicrosoftInternetExplorer402DocumentNotSpecified7.8 Normal0 Black Material: ABS Type: wireless doorbell Power source: battery Power Voltage:110~230(V) Power consumption:0.25(W) Ringtones:38 Scope of application: home, villa Doorbell size:4x4x5.6 cm/1.57x1.57x2.2 in Receiver size: 5.4x4.5x7.8 cm/2.12x1.77x3.07 in 150 metre wireless range: With a reliable wireless range of 150 metres for one-to-one pairing, the Plug-In Door Chime has a strong signal penetration to ensure that you don't have visitors, even if you're several rooms away or on another floor. Also a pager.: press the transmitter when you are alone and in need, and the bell will ring! 38 melodious ring tones: The receiver doorbell has 38 tunes and multiple volume adjustment meters Easy to install: The doorbell is easy to install, just plug the plug-in doorbell receiver into the socket and then fix the outdoor remote doorbell transmitter to the wall with the supplied accessories. Memory function: The last set melody and volume can be remembered when the power is off Package Included: 1 x Doorbell 1 x Ding Dong Machine 1 x Instruction manual