Provided are a method and an electronic device that may be coupled to a host device, the electronic device including a housing detachable to the host device, a light generator disposed on a first surface of the housing, a power transmission circuit disposed on a second surface of the housing, the second surface being opposite to the first surface, and a processor that controls the light generator to output a light, wherein an external electronic device moves to a predetermined position based on the outputted light, and control to wirelessly transmit power to the external electronic device via the power transmission circuit based on the external electronic device moving to the predetermined position.