Wide range of uses: The EM285 circuit tester can be used for continuity, polarity of a voltage, test lamp, checking electric motor and locating short circuits, for bad ground contacts etc. Long cable: The cable length is about 16 feet which allows you to examine any electrical system. Short circuit protection: The device has short circuit protection and can be used directly for bad ground contacts. Easy to use: After a simple connection of the device to the vehicle's battery, vehicle technicians can lead a positive or negative battery current to the tip by flicking the switch forwards or backwards. Comprehensive 6-24V DC kit: Do not use on AC voltage. Instructions for use: Unroll the device's cable Attach the red clamp to the vehicle battery's positive terminal Attach the black clamp to the vehicle battery's negative terminal 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 differ a little from the real thing. The allowed measurement error is +/- 1-3 cm.