EBL LCD Smart Individual AA AAA Rechargeable Battery Charger for Ni-MH Ni-CD Individual charging status for each slot, can freely charge 1,2,3,4 Ni-MH Ni-CD AA/AAA rechargeable battery. Smart LCD to show its charging progress separately, the battery icon stop flashing when fully charged. Advanced MCU control and -V function, over-heat and over-current protection, short-circuit protection, non-rechargeable and defective battery detection. Trickle charged mode will help maximize the capacity of battery to full. Worldwide usage: 100-240V AC, 50/60 Hz. CHG -- Charging; DISCHG -- Discharging; ERROR -- install the battery incorrectly or the battery is broken one.