Features: Portable external supply, provides enough power for 4 x 18650 li-ion batteries. Micro USB Input, one cable can charge the power bank, easy to operation. Dual outputs, it can charge phones, pads or other small electronic devices simultaneously. Independent charging circuit, each circuit works independently at the same time without influence. TOMO intelligent charger has a fast and high-performance chip, provide 6 kinds of protection. Multipurpose battery box, power bank/charger/storage box. Use fireproof material, strong and durable. Accurate display of power, each lamp represents approximately 25% of the charge. When it comes to the reverse polarity, the inside chip will automatically identify and cut off the power of the reversed polarity circuit, show an empty battery level.