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® 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™ 9-32V DC.