The XTAR X4 Fast Charging Battery Charger is a versatile, high-speed solution compatible with Ni-MH, Ni-CD, and Li-ion batteries. Designed with dual input ports for flexible charging options, it also serves as an emergency power source for USB devices. Its advanced dial-LCD screen provides real-time charging status, offering one-click access to all essential information. Equipped with a smart 3-stage charging system and 0V/-V technology, the XTAR X4 ensures efficient and safe charging while extending battery life, making it an ideal choice for fast and dependable power replenishment.