Multi-Functional Auto Electrical Circuit Tester with LCD Display and LED Flashlight - tests continuity, polarity, voltage, frequency, misfires 20-foot extension cable (extendable to 40 feet) - allowing you to work from bumper to bumper Circuit breaker protection - automatically shut-off if current exceeds 5 Amperes With built-in flashlight and additional extension probe, alligator clips, cigarette lighter adapter Four modes - voltage meter, misfire locator, frequency meter, and threshold detector One-year warranty