The present invention provides for a dental appliance, mouthguard andor divers mouthpiece using an anti-microbial composition that combines the use of an elastomeric polymer composition with micronized or submicron sized particles of metal or organoinorgano metal complexes. The drive detection circuit implements switching between a first state and a second state and detects an electrostatic capacitance change in the first state and an electrostatic capacitance change in the second state. After guaranteeing the performance of cell edge user at first, mode selection should be applied to select suitable paired users in order to increase the cell average throughput. The charge transfer process can be performed in air or, in some embodiments, in a vacuum chamber. In certain embodiments, a magnetic head has a coil, which has a lead coil turn minimally spaced from a main write pole. A driving roller unrolls the paper from the paper holder in response to a signal from an electronic sensor.