Self-powered Wireless Doorbell, Wireless Remote Control, Wireless Penetration, Without Battery Wireless Doorbell EU Plug Self-Powered Outdoor Waterproof Door Bell 1.32 Songs Home Welcome Door Chimes 2.150M Long Wireless Control Distance 3.Waterproof Door Bell 4.Four leverls of volume 5.Self-Power,No battery required Strong Signal It can penetrate 3-4 walls and wireless range up to 150 meters in open area,great for large house including willas, apartment,offices,shops,warehouses.etc. IP68 Waterproof level Rainy days can also be used,saed and durable 38 Songs Home Welcome Door Chimes The doorbell can be muted when sleeping Not only a doorbell but also a pager When the elderly,babies,and pregnant women sleeping alone have needs,press the transmitter and the bell will ring. Smart learning mode User-friendly design Technical paramerers 1.Operating voltage:AC 100-230V 2.Power consumption:0.25w 3.Wireless frequency:433 MHz 4.Operating temperature:>-10~+45C 5.Ringtone volume:>50dB/1m 6.Transmitter:no need battery 7.Receiver size:L95xW54xH68mm 8.Transmitter size:L80xW50xH28mm 9.Wireless distance:150 meter(open space) Only sell the doorbell in the picture, the rest of the goods are for reference only and not for sale