Features: This battery box have waterproof function. No need to welding the battery, which greatly reduces the internal resistance of the battery, improves the discharge performances of the battery, and effectively increases the battery lifespans. Easy to use, using 4pcs 18650/26650 batteries. It have a Direcr Current connector input and output voltages of 16V. The USB connector outputs a voltages of 5V and a current of 2A, and have the function of charging mobile phones. It have a power display function. (3 LED display lights) Specifications: Material:ABS Input voltages: 16.8V Overcharge protections voltages: 4.2V Over discharge protections voltages: 2.5V Overdischarge protections current: 7A Standbys current: 100μ A USB output standard voltages: 5V ± 0.2V USB maximum output: 2A ± 0.3A Package Includes: 1Set Battery Case note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.