KERUI Wireless Doorbell with 1 Push Button and 1 Plug in Receivers Operating at 500-feet Range with 32 Chimes, No Batteries Required for Receiver Long range transfer: 500-feet range, this wireless plug in doorbell is suitable for large villa; either you are occupied in the garden or at the kitchen, cordless doorbell can remind you that someone is calling from outside 32 songs optional, 4 levels adjustable volume,unique, elegant and modern design with LED flash alert on receiver& transmitter: adjusting volume and songs according to your requirements. For example, when baby is sleeping,low down the volume, while holding a party,volume could be higher Memory function: wireless bell kit won't lose setting upon power failure Doorbell Chimes Easy installation, plug and play: Wireless and environment friendly, plug in socket and function normally Excellent cold temperature resistance and environment corrosion resistance: This ring doorbell can protect internal circuit well under different environment