These charge controllers are designed by Specialty Concepts Inc. for the RV market. They are designed to flush-mount in a rectangular cut-out. They have a digital amp- and volt-meter for accurate information and an LED bar graph display for at-a-glance battery status. Charging is set to stop at 14.4 volts and resume at 13.0, but the full charge level can be adjusted by turning a small screw on the back of the circuit board. Terminal strip on back of unit accepts up to 10 AWG stranded wire. The Mark 15 and 22 controllers have array and battery fuses on the back of the panel and a switch to set the display to volts, amps, or off. The optional black anodized aluminum box can be used to surface-mount this controller on a wall. Knock-outs are provided for wiring. Dimensions: 7.5" W x 4.25" H x 1.5" D. 5-year warranty.