A remote-controlled mains power switch is provided, which is suitable for supplying mains-powered equipment such as TVs or personal computers with electricity. The switch comprises mains power input, an electricity storage device, a control circuit and a sensor for receiving signals from remote controlling equipment, which is ordinarily supplied with the mains-powered equipment. In use, the electricity storage device is charged by the mains power whilst the mains-powered equipment is in use, the control circuit is powered by the electricity storage device and is operative to selectively switch the mains power supply on or off in response to signals received from controlling equipment.