The XTAR X4 Fast Charging Battery Charger is a versatile, high-speed charger compatible with Ni-MH, Ni-CD, and Li-ion batteries. Featuring a dual-input design for flexible charging options, it also doubles as an emergency power supply for USB devices. The innovative dial-LCD screen displays real-time charging status, with one-click access to all information. Its smart 3-stage charging system and 0V/-V technology ensure efficient, safe charging while prolonging battery life, making it the perfect choice for quick and reliable power-ups.