Wide Application: The EM285 circuit tester can be used to test continuity, test the polarity of a voltage, check lamps, check electric motors, trace and locate short circuits, test bad ground contacts, etc. Long test cable: The cable length is about 5 meters, which allows you to easily test all electrical systems. Short-circuit protection: The unit has short-circuit protection and can test bad ground contacts directly. Easy to use: After simply connecting the unit to the vehicle's battery, the car mechanic can lead a positive or negative battery current to the tip by flipping the switch forward or backward. Complete 6-24V DC test kit: Do not use on AC voltage. Instructions for use: Unroll the unit's cable Attach the red clip to the positive terminal of the vehicle's battery Attach the black clip to the negative terminal of the vehicle's battery Operating voltage: 6-24V DC Overload protection: 8A (When the current exceeds 8A, this item will automatically disconnect the power.) Color: black + red Material: plastic + metal Package contents: 1 * Circuit Tester Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture to be a little different from the real thing. The allowed measurement error is +/- 1-3 cm.