Features: 3-channel mini USB battery charging adapter for 13 Black support up to 3 batteries at the same time, also can be as a storage box to store batteries. Fast charging speed and stable connection ensures all batteries are fully charging within 2 hours. You can use Mini USB C charging cable (included in the package) or USB TypeC cable to power for battery charging. Safe Charging:with multiple protectings such as overcurrent protecting, overvoltage protecting, overcharge protecting overdischarge protecting, over temperature protecting, and over power protecting CLEAR CHARGE INDICATOR: Intelligent LED indicator prevents the battery from overcharging. Small Storage Case: This battery charging and storage case is lightweighted, easy to carry. Specifications: Component： Plastic for 13 Black Battery Charging Storage Box Size:about 5.8x5.9x5.2cm/2.28x2.32x2.05in Input：5V2A Output: 4.48V 650mAx3 Charging Port： USB Package Includes: 1PC Battery Charging Storage Box note: Due to the problems of lighting effect, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurement.