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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.
A sound extender, sometimes called a chime extender or sound amplifier, is a device that allows you to hear your doorbell in areas where the doorbell is difficult to hear. This typically occurs in areas located at a far distance from the main door or where loud activities prevent the bell from being heard. Many wired doorbell systems offer sound extenders as accessories. Or, in many cases, you may add a wireless sound extender to an existing wired doorbell system.