THIS COMPACT POWER BANK MAKES IT PERFECT TO KEEP WITH YOU AT ALL TIMES. HAS A 2200 MAH CAPACITY AND INPUT DC: 5V/550 MA. OUTPUT DC: 5V/1000 MA (1 AMP). INCLUDES CHARGING CABLE TO CHARGE THE POWER BANK THROUGH YOUR COMPUTER OR USB POWER SUPPLY. POWER BANK IS FULLY CHARGED WHEN THE LIGHT IS NO LONGER ILLUMINATED. THEN PLUG YOUR OWN DEVICE CHARGING CORD INTO THE BANK'S USB PORT AND CHARGE AWAY. THE PLASTIC DOUBLE WALL EXTERIOR ENSURES A STURDY BUILD WITHOUT FEAR OF BREAKAGE. 3.5" H X 1" W