Powerology 20000mAh Retractable Cable Power Bank - is a highly functional power source featuring a high 20000mAh battery capacity and a built-in retractable cable system that completely eliminates cable clutter. The integrated cable extends when needed and retracts smoothly into its housing when finished, eliminating the need to carry extra cables during trips. Its high output power and advanced fast charging technology restore the energy of your smartphones and tablets in minimum time. Additional output ports enable the safe and parallel simultaneous charging of multiple devices. The ergonomic housing structure and built-in smart protection system fully safeguard connected equipment from overvoltage, overheating, and short circuits.