Features: Easy assemble and disassemble. Detachable, come with 2 cables, no need welding. 2x 3.7V 18650/18700/20700/21700 batteries can be installed. Original cable does NOT support fast charging, you need prepare the fast charging cable yourself and then achieve fast charging function. Has anti-reverse connection protector, and the battery will not burn the board if installed reversely. When installing, the positive and negative poles of multiple batteries will burn the board in different directions, and the same pole direction is required. Specifications: Material: Plastics Output Voltage: 5.2V Output Current: 2.1A Input Voltage: 5V Input Current: 2.1A USB Output: 5V/4.5A, 9V/2A, 12V/1.5A Type-C Output: 5V/3A, 9V/2A, 12V/1.5A Type-C Input: 5V/3A, 9V/2A, 12V/1.5A Working Temperature: -10 to 40 Size: Approx. 56x31x90mm/2.20x1.22x3.54in Type: Micro/Type-C Color: Red/Black/White Note: 2x 3.7V 18650/18700/20700/21700 batteries can be installed.(Batteries NOT Included) All batteries have life-cycle. Please do not use broken battery. The internal-resistance of the battery will increase after being used for long-time. Too high internal-resistance will affect the normal volt rise of the motherboard and the current limiting of high-power output load. It is recommended to use new battery. Please confirm that the volt is between 3.2-4.2V before purchasing. Package includes: 1x Powerbank Cases