The black 6700mAh Power Bank is a lightweight and portable battery pack that allows you to charge one device at a time using its 2.4A USB Type-A port. With a capacity of 6700mAh, this battery pack is compatible with virtually all devices that may be charged via USB. It is equipped with a four-LED battery level indicator that helps to monitor its remaining charge, recharges in around three hours using its 2.0A micro-USB port, uses iSmart 2.0 charging technology to identify and properly charge specific devices, and employs an MCU controller to limit the main power and output current. It also features 5-in-1 protection against overcharging, surges, high temperatures, high voltages, and short circuits, and uses a fire-resistant case to help protect against fire hazards and high temperatures. Thanks to an auto wake-up function, if charging does not automatically begin when a device is plugged in, simply press the power button and the unit will wake up and start charging. Thanks to LG/Panasonic 3350 battery cells, RAVPower's 6700mAh Power Bank can last for more than 500 recharge cycles.