Condition: New Available Colors: Black Long Range Up to 1000 Feet (300 m): Either you are occupied in the bedroom or at the kitchen, it can remind you that someone is calling from outside. Free your worry about missing visitors. 38 Melodies with 3-Level of Adjustable Volume: The wireless doorbell offers a wide selection of 38 chimes for your personal taste, including Christmas song (jingle bells etc.). 3-level of volume range from 20dB to 85dB. Easy Installation and IP 44 Waterproof Transmitter: Just plug the receiver into a wall outlet, install the push button with provided double sided tape or screw it to the wall (screws are included).The push button is rated IP 44 and weatherproof for outdoor use.Never worry about rainy day. DIY Expandability and Low Power Consumption: You can expand each transmitters with up to 10 receiver. Code learning function makes it easy to customize your doorbell with multiple transmitters and receivers. Powered by 12V 23A battery, the transmitter is tested to ensure up to 10,000 times of press for daily use, eliminating needs of replacing battery frequently.