Self-generating Christmas Doorbell Home Battery-free Wireless Doorbell Through Wall Elderly Pager With 38 RingtonesFeature:Color: WhiteMaterial: ABS Type: wireless doorbellPower source: self-poweredPower Voltage:110~230(V)Power consumption:0.25(W)Ringtones:38Scope of application: home, villaDoorbell size:4x4x5.6 cm/1.57x1.57x2.2 inReceiver size: 5.4x4.5x7.8 cm/2.12x1.77x3.07 in150 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 metersEasy 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 outagePackage Included:1 x Doorbell1 x Ding Dong Machine1 x Instruction manual