Scandvik Tortuga Dimmer 12/24V. Touch the "up" button to turn the light on and touch the "down" button to turn the light off. Press and hold either up or down on the included switch to increase or decrease the light output level to your liking. Release it at any point to maintain the current brightness. Specifications for Scandvik Tortuga Dimmer: Manufacturer: Scandvik Light Type: Interior Package Contents: Scandvik Tortuga Dimmer Scandvik 41598P: Tortuga Dimmer 12/24V