DIY mobile power box: Large capacity, 8 x 18650 batteries (batteries are not included). Dual USB mobile power supply, two devices can be at the same time. Three input ports: Micro-Type, Type-C, compatible with three commonly used mobile phone/tablet interfaces. Smart fast charging: Fast charging can easily extend the life of mobile phones and tablets. Intelligent 18650 battery charger: Compatible with flat and pointed 18650 rechargeable lithium batteries . Each battery slot is and tested separately. When the battery is fully , it automatically stop charging. (Note: Please pay attention to the positive and negative pole) Power indicator: The power indicator represents the percentage of the total battery power. Install the battery for the first time, install a single battery, and the switch to test whether the battery is good or not: if the indicator light is on, the battery is normal; if the indicator light is not on, the battery is faulty. Portable design: Easy to carry and use. Model Number:18650 Battery Case Item Type:DIY Box & Shell Batteries Need:8x18650 lithium battery(Not Include) Colour:B:Black Material:plastic Package Contents: 1 supply case Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.