Devices and systems are for adapting a mobile computing device, such as a handheld radio frequency identification (“RFID”) reader, with a grounded metallic housing substrate without impacting the performance of the device. The device includes a heat generating component, and a heat sink in thermal contact with the heat generating component, the heat sink including at least one thermally conductive material. The system includes a mobile computing device including a heat generating component, and a heat sink in thermal contact with the heat generating component, the heat sink including at least one thermally conductive material.