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 for bad ground contacts, etc.Long Test Lead: The cable length is about 16 feet, allowing you to easily test any electrical system.Short Circuit Protection: The unit has short circuit protection and can test for bad ground contacts directly.Easy Operation: After a simple connection of the unit to the vehicle's battery, the car mechanic can conduct 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 cableAttach the red clamp to the positive terminal of the vehicle's batteryAttach the black clamp to the negative terminal of the vehicle's batteryOperating voltage: 6-24V DCOverload protection: 8A (When the current exceeds 8A, this item will automatically disconnect the power.)Color: black + redMaterial: plastic + metalPackage contents:1 * Circuit testerOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.