A handheld device with a compact integrated touch panel is disclosed. Positive DC supplied to the coil magnetizes the magnetic member to an N polarity repelled by the N pole and attracted to the S pole and held at that position by stopping the current for macro photographing mode. Subsequently, a formal clock domain crossing verification method may be applied to the identified clock domain crossing boundaries, resulting in clock domain crossing assertions being identified. In the event of a reverse battery connection, one or more of the protection circuit’s P-channel and N-channel MOSFETS can switch to a non-conductive state to isolate the device’s load from an incorrectly installed battery and prevent the incorrectly installed battery andor other parallel-coupled battery from prematurely discharging.