Features: Wide range of uses: the circuit tester can be used to test continuity, test polarity on a voltage, check lights, check electric motors, track and locate short circuits, test for bad ground contacts, etc. Long test cable: The cable length is about 16 feet which allows you to easily test all electrical systems. Short circuit protection: The device has short circuit protection and can test for bad ground contacts directly. Easy operation: After a simple connection of the device to the vehicle's battery, the vehicle technician can lead a positive or negative battery current to the tip by wiggling the switch forward or backward. Comprehensive 6-24V DC test kit: Do not use on AC voltage. Instructions for use: Unroll the device'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. Specifications: Color: Black. Material: plastic. Operating voltage: 6-24V DC. Cable length: 16 feet. Overload protection: 8A (When the current exceeds 8A, this item will automatically disconnect the power.) Package contents: 1 x 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 a little different from the real thing. The allowed measurement error is +/- 1-3 cm.