Wonderful Home Wireless Doorbell, IP65 Waterproof Door Bell Chime Kit Long Range 1050ft, 2 Transmitter Buttons & 3 Plug in Receivers, 38 Melodies 5 Volume Levels LED Flash, Black

Specifications: Plugs into Any Standard Wall Outlet. Flashing Light Indicator. Wireless Range: 1050ft maximum in the open air Internal Sounds: 38 Chimes Volume: 5 level adjustable levels (25db to 110db) Receiver Power: AC 110V ~ 220V 50Hz / 60Hz Transmitter Power: 1 x 12V 23A battery(there is also a battery inside the doorbell) Package 2xTransmitter Button 3xReceiver 2 x please press the doorbell sticker 2 x double-sided adhesive 4 x large screw?2 x small screw 4 x expansion tube 1 x lanyard 1 x standby battery(Have also a battery inside the doorbell)