For one motor, 24V DC. With dynamic parking. With intermittent delay. feature for permanent magnet electric wiper motors. Ensures dependable control of windshield wipers on heavy duty vehicles. Negative ground only. 4 positions: Off-Park - intermittent range - Low - High. push-to wash one to three wipes after knob is released. Black plastic knob with metal insert and set screw , with white SAE imprint. diecast case 2 7/32" (56.4mm) square, 1 13/16" (46.0mm) long. 7/16 - 28 thread mounting stem 0.45" (11.3mm) long. Hex nut and lock washer included. Switches conform to SAE J1455, SAE J112a and SAE J234. switch controls most two-speed wiper motors. Microprocessor design. Six color-coded wire leads, 5" (127.0mm) long. With round knob imprinted with SAE washer-wiper symbol.