Lenovo PB500 Power Bank, 10000 mAh, Slim Design, Polymer core, Dual-output USB interfaces,&nbsp;Black, GXV0J50547 Max your power - Lightweight and portable, palm-sized but with high capacity (10000mAh). Do twice as much - Charge two devices simultaneously with the dual USB port (2.1A & 1A output). Safe and reliable - Supports over-charged, over-discharged, over-voltage and over-current cells. Also provides short-circuit protection. Safety guaranteed.