It is an object of the present invention to provide a toner having the transfer efficiency and the cleanability in combination, exhibiting excellent stress resistance, and ensuring the low-temperature fixing. A plurality of inner walls are disposed within the outer boundary wall. A port connects the interior and exterior. The low pain waveform control unit initially discharges the capacitors in parallel to generate a first step of the pulse waveform while periodically shunting a portion of charge through the RC filter to reduce peak voltage. The tabs and the flanges support the weight of the junction box on the drywall. The contacts may be selectively designated as either ground or signal contacts such that, in a first designation, the contacts form at least one differential signal pair comprising a pair of signal contacts, and, in a second designation, the contacts form at least one single-ended signal conductor.