The stainless-steel LED continuous adjustment dimmer switch features color coded dimming levels. When off the LED ring is orange, maximum bright the ring is green, lowest light level it’s purple, in between stages are shades of blue. A short press turns the light on and off, then a longer press activates the dimming/brightening function. Memory function turns the light back on at the same brightness level as when it was turned off. 12VDC. IP67 waterproof rating. Head Diameter: 7/8". Total Depth (including threads): 7/8". Thread Diameter: 3/4". Maximum Amps: 1.5.