Battery Charger with (4) AAA Rechargeable NiMH batteries has 3 easy steps to renewable power. Insert battery (batteries) into Charger and Select Mode: Charge, Discharge/ charge, Refresh/ charge, Test/ charge and then select charging current (Rate) (200mA to 1800mA). Works with all NiCd & NiMH AA/AAA Rechargeable Batteries, Automatically switches to trickle charge when charging is complete to ensure maximum battery capacity; Automatically defaults to 200mA charge (the optimal setting for prolonging battery life); Overcharge detection to protect battery life; Selectable charging current: 200, 500, 700 or 1000mA. When only channel 1 and/or channel 4 are used, can select up 1500 or 1800 mA. Charges AA & AAA rechargeable batteries simultaneously, Will not charge defective batteries, Overheat protection to protect battery life. If any one battery or circuit overheats, the charger will stop all channels charging and discharging. When charging is complete, LCD shows capacity in % charged for each battery. Uses any AA battery with adapter to power electric/ electronic devices requiring C or D batteries. Includes 4-C Size Battery Adapters, 4-D Size Battery Adapters, 4-AA Rechargeable NiMH Batteries, Nylon Travel Bag with deep main pocket with 2 inner pockets, Divided zipper pocket perfect for battery storage, Strong adjustable nylon strap with detachable metal clips.