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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.
The wireless speakers are the left surround and the right surround, which rest behind you. A small, wireless receiver box connects to a power outlet and sends the signal to the two rear speakers. This setup eliminates running speaker wires from your receiver to your rear speakers.