Specification: Material: ABS Working temperature: 0-40°C Trigger point: High voltage coil No.1 spark plug Input voltage: 12V Speed: 200-10,000 r/min Color: Black Size: As shown in pictures Features: The handle is ergonomically designed with comfortable press keys, providing excellent tactile feedback and easy operation. High-quality construction ensures durability. This timing device operates at 12V and is suitable for cars, motorcycles, and all gasoline engines with two-stroke or four-stroke configurations. It can visually display the ignition timing mark on the engine flywheel or belt pulley, allowing for accurate adjustment. Capable of testing the ignition timing in relation to the engine's knock control system and vacuum advance system, showing changes in advance angle as engine speed varies. Allows resetting of ignition timing after prolonged engine wear, routine replacement of timing belts and pulleys, or reduced cylinder pressure. Proper ignition timing is critical to engine performance. Incorrect timing may result in difficulty starting or failure to start. If timing is too advanced, it may cause metallic knocking sounds ("pinging"), increased starting resistance, hard engine rotation, reduced power, unstable idling, and vibration. If timing is too retarded, it may lead to hard starting, lack of power, increased fuel consumption, and accelerated engine wear. Notice: Power supply is 12V—connect red wire to positive and black wire to negative. Avoid incorrect connection. The high-voltage induction clamp must be attached to the high-voltage cable of cylinder No.1, with the arrow on the clamp pointing toward the spark plug for proper function. Package includes only the items listed. Other accessories are not included. Package Included: 1 Set x Ignition Timing Device