1. Max current output 4.5A(SR4) / 7.8A(SR8) 2.Power supply 24-28V (SR4)/24-75V(SR8) 3.Microstep 2-256 available 4.small size Main features:1.Small size, larger current output, the largest current output 4.5A(SR4) / 7.8A(SR8)2.Power supply 24-28V (SR4)/24-75V(SR8)3.Microstep 2-256 available, 8 different resolutions selectable via switch4.Optional motor parameter, 8 different resolutions adjustable ...