Fast Charge and Fit Charge Technology: Smart connect technology auto-detects connected device for the fastest charging. Auto detects the voltage and current of your device and delivers the fastest possible charge speed up to 2.1 amp. Dual Input and Dual Output: Not only the traditional USB cable, you can also use the same lightning cable to charge your iOS device or power bank. Dual USB output can charge 2 devices simultaneously at max speed with more current. Premium Compact Design: Pocket-sized, super portable, easy to hold in your hand and put anywhere. Convenient to carry with on the way. 100% AL-alloy CNC shell (same as MAC book) Ultra-High Capacity: Super Light Weight (8.8 oz) yet charges the iPhone 6s 3.5 times, iPhone 7s 2.5 times, the Galaxy S7 twice. Certified Safe: Multi-Protect safety system ensures complete protection for you and your devices. Built-in 0.3mm AL-shell battery covering. Auto safety cut-off with built in over-heat, over-charge, over-current, over-discharge, short-circuit protection. Backed with an 18-month guarantee.