Wide range of applications: The EM285 circuit tester can be used to test continuity, polarity of voltage, check lamps, electric motors, locate short circuits, and test for bad ground contacts. Long test lead: The cable length is approximately 16 feet, allowing easy testing of various electrical systems. Short-circuit protection: The unit includes short-circuit protection and enables instant testing of ground contact issues. Easy operation: After connecting the unit to the vehicle's battery, users can apply positive or negative battery current to the tip by toggling the switch forward or backward. Comprehensive 6-24V DC test kit: Designed for use with DC voltage systems only. Do not use on AC voltage. Operation Instructions: 1. Unroll the unit's cable. 2. Connect the red clamp to the positive terminal of the vehicle's battery. 3. Connect the black clamp to the negative terminal of the vehicle's battery. Operating Voltage: 6-24V DC Overload Protection: 8A (The unit will automatically disconnect if current exceeds 8A.) Color: Black and red Material: Plastic and metal Package Contents: 1 x Circuit Tester Note: Other items not included. Note: Lighting and display settings may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.