Customer Service supports 2 years of product quality assurance and 7 x 24h customer service. Please dont hesitate to contact us if there are any questions about our jump starter battery pack.Upgraded 3.0" LCD DisplayVisible 3.0" LCD portable car jump starter clearly displays all the information you need. When you have drained batteries on a road trip, you don't have to guess by the indicators anxiously or wait hours for AAA/someone for help on desolated interstates.Powerful Performance Car Jump Starter with the super 4000A peak. Jump starter Can easily jump-start (up to 10.0L gas or 8.0L diesel) 12v vehicles in 1-2 seconds. up to 40 times on a fully charger.Intelligent Secure ProtectionOur battery jump starter has 10 different safety features advanced intelligent clamps protect against short circuits, over-temperature, over-charge, over-discharge, reverse polarity, and more, providing protection for both you and your vehicle. Combined with excellent conductivity and heavy-duty clamps with tension for the fast and safe start-up of a dead car battery even in extreme environments from -4F to 140F.Multifunctional Car Jump StarterThis jump starter box can be used as a mobile power bank (Input18W Type-C, OutputUSB 5V 2.4A, USB 5V/9V/12V Quick Charge) LED flashlight with 3 modes( flashlight, SOS, strobe). to help you in the dark or in emergencies.