Millenium AA-Cell Battery Wall Charger with AA-Cell 4-Pack Rechargeable Power Cells Charge two and four AA NiMH/NiCd batteries at a time Mechanical switch distinguishes between NiMH and NiCd charging regimes Red LED illuminates when charging Green LED illuminates when charging is complete Can charge NiMH in about 14 hours and NiCd in about 7 hours