The Authenitc Nitecore D4 4-Slot Digital Battery is a black colored charger and made of ABS. The battery charger is compatible with Ni-Cd, Li-ion, and Ni-MH rechargeable batteries of various sizes. This helps in doing away with owning a separate charger for each type of battery. The charger can also charge LiFePO4 batteries with a manual setting. It has four micro-computer controlled charging slots that can charge four batteries at the same time while monitoring each battery separately. The charger has a UK type plug and built-in LCD screen to give information about the current, voltage, charging progress, and time required to charge. There is an automatic power-off functionality that cuts the current flow when the charging process is complete. The charging unit has an optimized design for charging IMR batteries. There are a couple of buttons on the side to determine the charging parameters and battery type. The charging indicator turns green after the battery is completely charged. The flame retardant and resistant charger also offer temperature monitoring, over-charge prevention, and reverse polarity protection. It is sized at 100 x 144 x 37.6 mm and has a weight of 234 g.