Anlayliay [Easy Operation]Clamp the red clip to the positive terminal of the vehicle's battery. Clamp the black clip to the negative terminal. Hook up the sensor clip to the high voltage line of the No.1 cylinder. Note: The on the sensor clip should point to the direction of the to work properly. It also can work on 6-volt electrical , you just need auxiliary 12V battery to power the timing light. Colour:black Material:plastic Package Contents: 1 * Timing Light 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.