Hybrid PS20 Universal NiMH Battery ChargerHandy unit recharges any standard NiMH battery, up to four AAs, AAAs, Cs or Ds and one 9-Volt at once. Internal individual cell monitors and isolated current paths prevent under- and over-charging. Trickle-charge setting helps maximize cell life. Automatic shutdown and batteries-ready LED indicator ensure safe, streamlined operation. Battery Type: NiMH; Battery Size: 9V;AA;AAA;C;D.