Disclosed is a wall-mounted device, which is mainly provided with a base and a cover plate, and the at least one module circuit board is provided in the cover plate. The power terminal of at least one module circuit board is electrically connected to an exterior live wire circuit of the base, so the interior live wire circuit is able to independently supply power to the module circuit board of the cover plate. As the result, the base is able to fit or replace with any cover plate provided with module circuit board, and connects to any electronic device or network to remotely control and operate.