Usage Tips:It is a strong alligator clamp clip with Plug connector. Works with car jump , and fits for most car jump portable . Designed with prevent reverse charge module, it is very safe and convenient. It is easy to install and use. Just plug and play. It is the perfect replacement or spare set of cables. Usage of Car Jump :Connect the red battery clamp of jumper cable to the vehicles positive (+) battery and connect the black to the negative pole. Plug the cord of jumper cable into the jumper socket. Start the vehicle. Cautions: Red clamp connect to the positive(+) battery terminal, black clamp connect to the negative(-) battery terminal. Do remove the clamps in 30s after the vehicle started. Do not connect and/or attach two clamps together, it may cause danger! Keep this appliance away from children. Note: Installation guide not included, Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Black Material:Plastic Package Contents: 1 x Universal Battery Booster Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.