3300mAh USB External Travel Battery Portable Backup Charger/Power Bank(Input:5V/1A, Output:5V/1A) for iPhone, Samsung and Other Android Smartphones (green) Premium A-grade cell, fast and high capacity, lipstick-shaped aluminum design, easy to carry & durable. Input: 5V dc 1.0A, Output: 5V dc 1.0A, recharges in 3-4 hours with a 1 amp adapter (not included) and the included Micro USB cable. Auto detect to charge your phone when cable connect and auto power switch off in 10 second when cable disconnect. Use your original phone cable to charge your phone to avoid incapability. Any questions please feel free to email us. We will do our best to help you!