Features: Usb power bank case for 18650 battery external DIY charger box kit universal for cellphones free welding Simply use the USB cable to charge digital products. (Battery, USB Cable Are Not Included) One end of the USB cable connect with the OUT port of the power bank, another end connect with the digital product ,it will start to charge. To charge power bank : Use USB cable with MicroUSB connector to charge power bank, the IN port the charging port of power bank. When LED red that means power bank is-charging. You can charge power bank from adapter USB or charging from computer USB. Specifications: Item: USB Power Bank 1x 18650 Battery Charger Box Battery type: Cylindrical Aluminum-Shell Material: Plastic + Electronic Components Size:approx 90x30x21mm/3.54x1.18x0.83in Input:DC5V 1A Output:DC5V 1A Color: Black/Green/Blue/Pink/Yellow/ Weight: 80g Package Includes: 1 PC x DIY Power Bank Case Box. (Battery, USB Cable Are Not Included) note: 1.Please note this DIY Power Bank Case Kit,You are required to assemble them yourself,and the battery not included ! 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!