After I put it to the test this portable charger for automotive needs was a huge letdown .While it claims to be a powerful and efficient charging solution, it couldn't even jump-start my car once. The compact size is convenient, but that's about the only positive. The charger`s lack of reliability and inability to deliver adequate power makes it an incredibly frustrating and ineffective choice for anyone looking for a dependable automotive charger. Don't waste your money on this product..