... working, Software is easy operating, Win 7 System and USB transmission. Specification for Portable EMGEP System:Amplifier:Channels: 2 ... Included in the Amplifier)Current intensity output range: 0 ~ 100mA, error ≤ ± 10%Stimulus modes: single-current stimulator, dual-current stimulatorStimulus ... frequency: 0.1 Hz ~ 100Hz, error ≤ ± 10%Stimulus width: 50—1000μsPulse duration error: 0.05ms, 0.1ms, 0.5ms ...