The battery clamp is made of high-quality copper material for excellent conductivity and enhanced safety. After the automobile is started, the anti-back charging current is less than 1A, making the clamp more reliable. Connecting the red clip to the black clip results in no damage or spark upon power-on, providing short circuit protection. The battery wire clip is constructed from premium ABS plastic, offering good insulation, resistance, and aging resistance. The test wire clamp is designed for emergency automobile starting and battery booster cable use, with strong practicality. This battery clamp features high-quality copper, an ABS plastic shell, and thickened silicone wire for superior performance. It delivers good electrical conductivity, water resistance, and wear resistance. The battery clamp maintains a stable 12V voltage, ensuring smooth power delivery to protect the vehicle. Notice: When the green light is on, do not create a short circuit or reverse connect to the car battery. Cautions: Remove the clamps within 30 seconds after the vehicle has started. Do not connect or attach two clamps together, as this may cause danger. Keep this device away from children. Note: Installation guide not included. Please verify the item thoroughly to ensure it meets your needs. Product design may be updated periodically; slight variations in appearance or color between batches may occur, but these do not affect functionality. Color: Black Material: ABS Package Contents: 1 x Emergency Battery Jump Cable Clamps Note: Light reflection and differences in display screens may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 1-3 cm.