Condition: The highly illumination allows for easy nighttime visibility. The same size as for a standard Lighter Slot The Engine Switch allows you to start your vehicle's engine only by the installed button. This universal engine switch allows for installation on any vehicle. DC: 12V (Fits for all vehicles) Dimensions: Outer Diameter for the ring - 3.7 cm (Dia) / 1.46 inch (Dia) Diameter for the hole - 3.0cm (Dia) / 1.18 inch (Dia) To Start Engine: 1. Use your key to turn the ignition key on. 2. the installed switch to start engine. Release as soon as the engine fires. 3.Two Blue Wire:to ACC Line and Start Line. Red is Postive,Black is Negtive Colour: Black + Silver Material: Plastic Package Contents: 1 x switch 1 x harness with accessories Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.