Self-generating Christmas Doorbell Home Battery-free Wireless Doorbell Through Wall Elderly Pager With 38 Ringtones Feature: Color: White Material: ABS Type: wireless doorbell Power source: self-powered 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. IP44 waterproof: Multifunctional remote control doorbell, IP44 and wireless doorbell chime. Withstands various harsh weather conditions, doorbell wireless can be used for home, offices, hotels, garages, shops, apartments, villas, gardens, hospitals and schools. 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: Remembers your last melody and volume level a power outage Package Included: 1 x Doorbell 1 x Ding Dong Machine 1 x Instruction manual