20000mAh Premium Quality lithium-Polymer battery Up to 72 hours extra of talk or surf time (hours of time and number of charges are estimated by comparing the iPhone 7 internal batteries specification on apple to the internal batteries of Tiitan Power bank; Results will vary by device and conditions) Dual charge technology for simultaneous charge of the power bank and a phone or other USB-powered device Up to 3-4 charges for Smartphone (hours of time and number of charges are estimated by comparing the Smartphone internal batteries specification; Results will vary by device and conditions) 4-level LED indication showing how much back-up energy is left in the power bank 2x faster charge of the power bank and the Smartphone takes to 2.4 Amps input and output (based on USB 1.0/2.0 battery charging speeds), comes pre-charged with 1-year guarantee and safety features, Power bank on plane – flight approved for carry-on luggage (Usage on board is subject to any applicable regulations) 1 year warranty provided by the manufacturer from date of purchase High Efficiency – 91+ % BIS Certified Power bank