Touch the red pad for red light, the white pad for white light. Hold your finger on the pad for more than 2 seconds and the lamp will cycle through four dimming levels. Completely sealed EuroLED^(R) Touch lamps can also be remotely operated from multiple points with 'off the shelf' On/Off/On momentary switches. Light levels and color are 'remembered' by the lamp's circuitry, even when a vessel's batteries are turned off. Multivolt(TM) 9-32V DC. Housing Black Dia. 129.5mm (5-3/32") LED Color Red/White Volts 12/24