The Built in USB C lightning connector can easily to charge your Phone without cable. Need to remove the phone case, and swipe up the telescopic switch before charging your phone, If charging while wearing a phone case, it's easy to loose, may cause poor contact and can not be charged. Built-in 1500mAh high quality battery, Suitable for outdoor emergency use, Weighs about 1.4 Oz, size of 2.75*1.57*0.70 inches, convenient to hang on the key ring, ultra-small and ultra-light. Safe circuit design support to charge your phone at a high speed safely, can avoid over-charge, over-discharge, short-circuit and overload, the LED indicator light flashes red when charging, and automatically stops flashing and stay light on red light after charging is completed.