This item is not working and is for parts. Item responds when pressing the on button as lights flash on but it will not remain on & does not hold charge Please note I have multiple of this item for sale & you may not receive the exact one photographed. All items bare a similar condition to the one in the photographs and I am happy to send over photos of the one I will send before purchase if you drop me a message. The NOCO Boost X GBX155 is a powerful 12V lithium jump starter pack with a peak amperage of 4250A. It is portable and features an LED light, reverse polarity protection, instant starting power, and a safety switch.