NITECORE UM10 USB universal smart battery Charger For 18650/18490/18350/17670/17500/16340/14500/10440 Features rear USB cable winder, Constructed from fire retardant materials, Features reverse polarity protection Features optimized charging program for IMR batteries, Intelligently select charging current based on battery capacity Priority mode offers either battery or USB charging, Enables data transfer via USB, Designed for optimal heat dissipation Integrated intelligent power management system, Intelligently detects input power, Intelligently distributes charging power USB powered Li-ion battery charger, High definition LCD display real time charging status, Features USB output charging