Four function digital readout and easy-to-read backlit LCD: Tachometer: 249 to 9,990 RPM Advance Degrees (2 and 4 cycle): 0° to 90° Dwell: 0° to 180° / 2-12 cylinders Voltage: 10 to 16 volts DC Switches from 2-cycle to 4-cycle Heavy-duty ABS/Polycarbonate shockproof housing, molded boots, built-in hand guard for protection Detachable 6-foot leads with metal inductive pickup Patented Skip Circuitry Test up to 9,990 RPM One-hand Operation Includes molded plastic storage case