This is a Duratrax 20 Amp 6-Cell Battery Discharger.
Battery Types: NiCd or NiMH
Cell Count: 1-6 single sub-C cells
Discharge Current: 20A
Discharge cut off voltage: .85V/cell approximately
Fan Input Power: Load cells or optional 7.2V or 12V DC input
Case Size: 5.25 x 4.25 x 6" (133x108x152mm)
Weight: 1.2lb (34g)
DuraTrax 20A Battery Discharger
Do not leave the cells on the unit for extended period of time as this will cause the unit to discharge the cells down to 0V which may permanently damage the cells.