BioMedical Life Systems EMS 2000 Neuromuscular Simulator is a Two Channel analog device with Three Modes of operation; Cycled, Constant, and Reciprocal. The device has adjustable On Ramp 0-2s, On Time 0-60s, Off Time 0-60s, and Pulse Rate 1-80Hz. The unit is powered by one 9-volt battery.