UNIT IS A DANFOSS VARISPEED 4000 / HAMPTON VARISPEED R400 REGENERATIVE DC DRIVE MOTOR CONTROLLER, P/N: 176B8013, 120V /240V, 90/180VDC  ARMATURE VOLT OUTPUT AND 2A MOTOR CURRENT, UPGRADABLE TO 10A BY REDUCING THE TURN WINDINGS ON THE T6 CURRENT SENSOR. THIS IS A WELL REFURBISHED DC MOTOR CONTROLLER THAT NEEDS ONLY THE HEAT-SINK. IT IS IN EXCELLENT CONDITION. SEE AND VIEW ALL THE PICTURES ATTACHED. . IMPRESSIVE!