Input voltage: DC 8-35V, (12V/24V lead-acid battery or lithium-ion battery can be changed to 5V) Output voltage: DC 5V; Each port output 2A/10W;Total current output is 8A/40W(max 4 USB charging ports can charge 4 devices at the same time. With integrated switch ultra-thin regulator module, the conversion rate is as high as 96%. With reverse polarityover currentover temperatureshort circuitlow voltageover charge protection to provide better protection for your device. Battery + converter = super power bank, perfect for home and outdoor travelers, can replenish the power of cell phones and other 5V electronic devices