Features: 18650 batteries are not included in the package, you need to purchase separately. Can only use the 18650 battery of which positive electrode is flat top. Made of high quality material, it is wear resistant and durable. Perfect for outdoor travel use. Welding Free 8x18650 alloy shells digital display 18W faster charging power bank case; Specifications: Material:Alloy Color:Black,Red,Gray;(Optional) Number of batteries: 8x18650 batteries Faster charging specifications (one of the following protocols must be supported): Integrated QC-2.0/QC-3.0 output charging protocol; Integrate FCP-SGCP, input/output charging protocols; Integrated MTK-PE+1.1&2.0 output charging protocol; Compatible for SC1.2, mobile phone charging; Integrated USB Power Delivery (PD-2.0/3.0) protocol Support PD-2.0/3.0 input/output protocol; Supports USB PD3.0 PPS- output protocol; PPS- supports output ranges of 5-11V and 20mV/Step; 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. Package includes: 1xPower Bank Case