You have a visitor! Gain an alert when a guest arrives at your door with the Medallion™ Series Doorbell Transmitter with Button. Supplied with a button for mounting at your entranceway, it connects by wire to a compact transmitter you'll position nearby. When someone presses the button, the transmitter signals any Medallion™ Series Mini Receiver. Intended for installation where there is no existing wired doorbell, it operates on two (2) AA batteries.