An adaptor for converting a conventional electronic device into one capable of being charged by a contactless charger is provided. A plurality of photoelectric transmitters and receivers are placed between the first member and the second member such that each receiver is within a liner-of-sight of each transmitter across the central opening and the signals sent between the receivers and transmitters fills an area of detection. The thickness of the downstream portion is increased gradually from the upstream side toward the downstream side. The first and second portions of the second data coil are connected at a second node galvanically isolated from the first node. The lid andor the base may be formed from any suitable materials, such as a transparent or non-transparent plastic material, andor a compostable material.