With over 3000-amps of starting power, it can jump start gasoline and diesel engines up to 32-liters It jump starts almost every type of vehicle and equipment, including semi-trucks (up to class 8), motorhomes, coaches, buses, mining, agricultural, construction, and vocational equipment - 6, 8, 12, and 16 cylinder - and more Simple, mistake-free design featuring spark-proof technology and reverse polarity protection, but with enhanced thermal efficiency and power management to provide better performance and longer battery life With two built-in 2.1A USB ports, you can power multiple devices at the same time, such as smartphones, tablets, action cameras, wireless headphones, wearables and more With over 137 watt-hours of lithium power, the GB251+ can provide endless hours of operation and recharge your devices multiple times before needing a recharge Charge directly from the vehicle's 12-volt auxiliary port or the XGC4 4-Amp Power Adapter to recharge it’s 242 watt-hours lithium-ion battery in 8.5 hours Equipped with an integrated voltmeter to help pinpoint battery issues The voltmeter doubles as a 60-second countdown timer, which shuts off GB251+ after 60 seconds to help preserve internal battery charge The GB251+ is equipped with a 600-Lumen LED flashlight with various brightness modes, SOS, and emergency strobe— handy to have as a roadside or road trip tool Battery Types 24 Volt Lead-Acid Battery Systems Diesel Engine Rating Up to 32 L Safe On All Engine Sizes Dimensions 8.62" H x 12.43" W x 3.68" D Gas Engine Rating Up to 32 L Includes GB251+ Lithium Battery Jump Starter; 56-Watt XGC Power Adapter; 12-Volt 2-Foot XGC Cable; Protective Carrying Case; User Guide & Warranty Information Internal Battery 137 Watt-Hour Lithium-Ion Operating Temperature -4°F to 122°F (-20°C to +50°C) Starting Current 3000 Amps (Peak) USB Output Dual 5 Volts, 2.1 Amps Max