Q-Tran's QT product offering includes every feature and benefit Q-Tran's product development team could think of rolled into one interior power supply. We are focused on making the quietest, most efficient, safest, most versatile, longest lasting power supply in the industry. The QT delivers and comes standard with 5 taps to allow the installer to fine tune the voltages at the transformer to get as close to the desired voltage at the fixture as possible. The QT is also UL listed to be either surface or recess mounted into a 2”x4” stud wall with the UNIQUE ability to install in any thickness drywall. (The QTM-DC and DC+CAP are listed for surface, wall mount only.) The QT housings are available in medium and large. The medium has a capacity of up to 750 watts and can house up to two transformers. The large housing has a capacity of up to 1500 watts and can accommodate up to four separate transformers.