This is an inexpensive charger for both NiMH and NiCd batteries. It will charge 2, or 4 AA or AAA cells at a time. Also charges 1 or 2 9V cells. The 9 volt charge plugs are under the AA batteries so you can charge either AA or AAA batteries - or 9 volt on each side at a time. Plugs directly into an AC outlet, no AC adapter or cables necessary.