Slim UL certified large capacity aluminum universal international emergency mobile smartphone battery charger with 2 USB ports. Features 4 blue LED indicator lights. All 4 blue lights shine to indicate full charge. Lights will turn off one by one as power is drained from device use. Lights flash while charging, and blink for 5 seconds when power bank is charging your device. Black power button on side panel below indicator lights. Individual phone attachments not included, only USB to Micro USB charging cable provided. Charge time differs by device. Must charge power bank prior to first use. Power supply / Technology: INPUT: 5V/1.5A; OUTPUT: 5V/1A and 5V/2.1A; Rechargeable Lithium-polymer battery; Capacity 5000mAh; Work current: 2100mA; Standby current: less 200uA; Operating temperature: 0~45 C for charging, 0~50 C for discharge. Powerful enough to charge tablet and laptop that require a current of 2.1A or less (check your device prior to purchase). UL certified device with UL certified battery. Instructions included.