Features: LCD Display DIY 5x21700 Battery Cases Power Bank Shells Portable External Boxes without Battery Power bank Protector; Fine workmanship provides long service life. Lightweight design is very easy to carry. Perfect for outdoor travel use. Charging and discharging protect: the circuit board has built-in lithium battery protect, which has overvoltage protect, overcurrent protect, undervoltage protect, etc; Specifications: Material:Plastic Color:Black,White,Blue,Green,(Optional) Number of batteries: 5x21700 batteries Dual Port Output:5V 2.1A One Port Output:5V 2A Package Includes: 1x Power Bank Pouch (Battery not include) note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.