VARTA LCD Dual Tech Charger Charger: Special charger for Li-Ion and Ni-MH batteries. Large LCD display for checking the charging process: volts, capacity (mAh) and minutes. 4 modes: charge, discharge, capacity test and refresh. Comprehensive safety features: minus delta U shutdown, safety timer, faulty battery and alkaline cell detection, polarity check, short circuit protection, temperature control. With single slot charging, USB output for charging external devices and can be used worldwide 100-240V.