800A Ultracapacitor Batteryless Jump Starter No battery inside. 100% maintenance-free. Microprocessor controlled. 10,000 cycle/10-year lifespan. Built-in voltmeter. Override Mode to start engine without any battery mounted. Glow Mode for cold start of diesel engine. Short circuit and reverse polarity protection. 3 ways to use: . Connect clamps to vehicle battery. Connect to vehicle’s 12V DC port. Connect to a power bank via Micro-USB port (cable not included). Contents: (1) DSR109 jump starter (1) 12V DC charging cable (1) Wrench (1) Manual DSR109