The battery clamp is made of high-quality copper material to ensure excellent conductivity and provide safety. After the automobile is started, the anti-back charging current is less than 1A, making the clamp safer and more reliable. Connecting the red clip to the black clip results in no damage or spark when powered 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 applications, with strong practicality. This battery clamp features high-quality copper, an ABS plastic shell, and thickened silicone wire as raw materials, ensuring good electrical conductivity, water resistance, and wear resistance. It maintains a stable 12V voltage, supplying power smoothly to protect the car starter. 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 meets your requirements before use. Product design may be updated across different batches; slight variations in appearance or color may occur but do not affect functionality. Color: Black Material: ABS Package Contents: 1 x Emergency Battery Jump Cable Clamps Only the above package content is included; other items are not part of this product. Note: Lighting reflections and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.