1. High-speed stepper motor, fast response. 2. Clear and bright adjustable 7 colors LED backlight with digital display! 3. The button on the lens can switch the light color you want. 4. Applicable models: all 12V cars 5. Diameter: 2 inches / 52 mm 6. Current: IGN MAX 0.3A ILM 0.3A 7. Power supply: DC (10-15V) 12V 8. Packing list: High Speed Voltmeter x 1 Harness x 1 Screw button x 1 English installation manual x 1