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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.
Doorbell Replacement Batteries All of the wireless doorbells on 1800doorbell.com use a wireless doorbell push button that acts as a transmitter. When the user presses the doorbell button, it sends a wirelss signal to a receiver. Because the button is not wired to a transformer (required for most wired doorbells) batteries are required in order for the button to generate current to send the signal. In almost all cases, wireless doorbell buttons are shipped with batteries. This is because, in most cases, these are not standard types of batteries you can pick up at your local store. To maintain the small size of the push button, these batteries have to be smaller than standard AA, AAA, or 9V batteries.