Advance Timing Light allows accurate adjustment of base and advance timing reading. Detailed instruction manual included. One year warranty.Features and Benefits Adjustable knob measures centrifugal, vacuum and computer advanceAll metal inductive pickupSuper bright Xenon flashOne touch controlDurable, plated ABS housing on light with heat resistant over molding on battery clipsKit IncludesActron CP7528 Advance Timing LightInstruction Manual