Guess Power Bank 4,000 mAh. 4 LED indicators, so you can monitor power charging at any time. • This power bank has non-slip coating, automatic shutdown after full charge, modern Guess style design. • This device has a number of security features, including against overcharging and overheating. • Collection: Triangle logo Type: Power bank Capacity: 4000mAh Input: 5V = 2A Output: 5V = 2.1A (Max) Size: 118 x 66 x 8mm. • This officially licensed product of GUESS includes CG Mobile's 1-year case limited warranty.