Horizontal auto transfer switch 20 A, 120V, 10 NEMA 5-20R receptacles, two LEDs power-on indicators with red LED current monitor, and dual 10' power cord with NEMA L5-20P twist lock plug. UL and c-UL Listed. Power Feeds A and B must be Phase Synchronized. Dimensions: 1.72"H x 17.0"W x 9.0"D (44mm x 431mm x 229mm)