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In recent decades, wireless doorbell systems that do not require wall wiring have become popular. The doorbell button contains a built-in radio transmitter powered by a battery. When the button is pushed, the transmitter sends a radio signal to the receiver unit, which is plugged into a wall outlet inside the building.
Wireless doorbells, buzzers and chimes consist of two units. 1  The pushbutton unit is battery operated. The sound unit runs on household current provided by a regular outlet. 2  Most of today's doorbells and buzzers operate on 10 volts. Most modern door chimes operate on 16 volts. Be sure the transformer you purchase with a doorbell, buzzer or chime is designed to provide the correct voltage for the mechanism you plan to install.