Features Wide range applications: The circuit tester can be used to test continuity, test polarity of a voltage, check lamp, check electric motor, follow and locate short circuits, test for bad ground contacts etc. Long test leads: The cable length is about 16ft which allows you test any electrical system easily. Short-circuit protection: The unit has short-circuit protection and can test for bad ground contacts instantly. Easy operation: After a simple hook-up of the unit to the vehicle39;s battery, automotive technician can conduct a positive or negative battery current to the tip by rocking the power switch forward or backward. Comprehensive 6-24V DC test kit: Do not use on AC-voltage. Operation Instrcutions: Unroll the unit39;s cable. Clamp the red clip to the positive terminal of the vehicle39;s battery. Clamp the black clip to the negative terminal of the vehicle39;s battery Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Operation Voltage: 6-24V DC Cable Length: 16ft Overload Protection: 8A When the current exceeds 8A, this item will disconnect the current automatically. Package List: 1x Automotive Electrical System Tester