Wireless doorbells (chimes)use radio waves to connect the switch to the bell components: a doorbell transmitter and a receiver.

Product Name: AC Sunflower Wireless Doorbell Model Number: RD-188 Melodies : 25 Multimusics Remote Control: 30-50m Working temperature: -20-50No wiring, no installation Application:home,office and store For receiver: Quiescent current: 2.7mA Working current: 128 mA Low power consumption: 0.6mW Volume: > = 80dB Power supply: AC110V-220V For transmitter Quiescent current: 0 Working current: 74 mA Transmitting power: 111mW Battery requirement: 1 "AAA" Packing Packing: Blister, 150pieces/carton Carton measurement: 48.2*39.5*47

AC music digital doorbell