1.Ni-Cd communication battery pack 2.AA batteries 3.1000mAh 4.3.6V battery pack 5.For cordless phone,walkie talkie,radio Work with, Aastra Telecom: MAESTRO 900DSSAmeriphone: CL40Audiovox: BT2400, GX2400, GX2401C, GX2411CIBell Equipment (Sonecor): MAESTRO 900DSSBell South: 36247, 36250, 42002, 42003, 42004, 625, 628, 638, 639,673X, 676, 678, 686, 698, 699, 711, 721, 799, 9003, 9004, 9005,9007, ...