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Features: Long Life: It lasts 20 times longer 4000 life spans than traditional jumper boxes and has longer standby power between jumps. LiFePO4 Lithium Battery: high Temperature Resistance high discharging current non explosive long cycle life > 4000 . For safe and easy use: The display led screen clearly communicates vehicle battery voltage with a built-in voltmeter warning messages and other information. Built-in Safety Protections: Reverse polarity anti-spark over-current over-discharge voltage detection and temperature protections ensure the user equipment are safe. Dual USB Ports: It can fully charge your cellphones pads and other electronics for up to 30+ times in one full charge. 12V DC Outlet: Designed to charge 12V devices including tire pumps car fridge car vacuum and more. No extra cable needed! ATTENTION: 12V and 24V manual override buttons are available to be used only when vehicle batteries are completely dead or heavily discharged. Please only use with great cautions! Outlets and voltage differ internationally and this product may require an adapter or converter for use in your destination. Please check compatibility before purchasing.