Inclusion Criteria:  History of traumatic SCI Less than 5months post SCI SCI injury level C1-C8 SCI categorized as AIS B-D Currently receiving inpatient rehabilitation at Craig Hospital Passive range of motion (ROM) within functional limits at wrists, shoulders, and elbows Demonstrate motor response to electrical stimulation in majority of UE muscle groups below level of injury (tested during screening) No complicating physical or cognitive conditions (as determined by their physician) that would preclude safe use of electrical stimulation Able to complete study as an outpatient if discharged from inpatient rehabilitation before completing 40 sessions of training  Exclusion Criteria:  Unstable chronic cardiac or respiratory complaints Current or history of UE contracture or skin pressure injuries that might interfere with intervention Received Botox injections within the last 3 months Pregnant Implanted devices including: pacemaker, spinal cord stimulator, ventriculoperitoneal shunt, deep brain stimulator, or intra-thecal pump.