Specification Brand: SPELAB SKU: SPOS20012-1 Input voltage: 12V Speed: 200-10000rpm Working temperature: 0-40C Material: Plastic Color: Red Pistol Grip Handle: 30*21*5.5cm Features: Ignition Timing Light: Design to re-timing your car`s ignition to get the best performance that you can. Suitable for car, vehicle motorcycle, marine,all two-stroke and four-stroke gasoline engines, easily operate on 12V ignition systems. Safe Professional Engine Timing Light: Solid-state burnout-proof polarity with automotive reverse, it is polarity and overload protection. It`s sliding clamp-on inductive pick-up, for easy and safe hookup. Pistol Grip Design: Handle pistol-type design conforms to the engineering design, the button is comfortable, feels good, facilitates the operation. Sensor Clips: The sensor clip is red and black to distinguish positive and negative poles, easy to use, and more secure. And the color of the wire is also different to prevent the glue sleeve of the clip to come off and difficult to distinguish. Operating Instructions: 1. Clamp the inductive pick-up around the number one (1) spark plug wire. Make sure the arrow on it is facing towards the spark plug. Do not allow the inductive pick-up to touch the exhaust manifold or surrounding parts as these areas become extremely hot and will damage the inductive pick-up. 2. Connect the RED clamp to the positive (+) battery terminal. 3. Connect the BLACK clamp to a secure engine ground such as the alternator bracket or the engine block. For safety reasons, do not use the negative (-) battery terminal or fuel system components as a ground connection point. Package includes: 1 x Inductive Timing Light Gun NOTE: Before adjusting the timing, the “dwell angle” or “gap” should be adjusted on vehicles fitted with contact breaker points.