No more frantic searching for an AC power outlet when your cellphone, tablet, or other mobile device's battery power is getting low. The UPB-12K0-2U Portable 12,000mAh Dual-Port Mobile Power Bank is the perfect power solution when you're on the road, or stuck somewhere without convenient electricity. It fits comfortably in your purse, backpack or laptop bag to keep your e-reader, MP3 player, handheld game console or Bluetooth device operating when you need it.Just connect your device to the UPB-12K0-2U's USB-A port using the included USB Micro-B cable or another cable suitable for your device. Press the on/off button to illuminate the LEDs that indicate the Mobile Power Bank's battery capacity at a glance. Press the button twice to use the unit as an LED flashlight.The portable UPB-12K0-2U's dual USB ports provide up to 5V, 1A and 5V, 2A of power, so you can charge two devices at once. Its 12,000mAh capacity charges devices at maximum power up to 4 hours. It protects against short circuits, overvoltage, over-current, overcharges and overdischarges. Charge the Mobile Power Bank by connecting its USB Micro-B port to a USB charger or a computer's USB-A port using the included cable. Press the on/off button, and the four LEDs will blink or light solid in various combinations to indicate the battery level.