A device case computer mouse includes a body including a cavity configured to attach the device case to a handheld computer, a motion sensor connected to the body, a battery connected to the body, and a charging port connected to the body and electrically connected to the battery, the charging port being configured to be connected to a case charging cable. Also included is a processor electrically connected to the battery and communicatively connected to the motion sensor, wherein the processor is configured to be communicatively connected to the handheld computer wirelessly and to a portable computer to transmit motion data from the motion sensor to the portable computer and to transmit input data from the handheld computer to the portable computer.