When visitors come calling you'll gain an alert with the Medallion™ Series Wireless Doorbell Transmitter. If a family member, neighbor or someone else presses the button, it transmits a signal to any Medallion™ Series Mini Receiver. Battery operated and not intended for wiring to existing doorbell circuitry, it is ideal for homes without doorbells, or for side doors or back doors where doorbells have not been installed. It combines the doorbell button and transmitter in one compact, easy-to-install unit.