screwdrivers low voltage electric controllers esp6 low voltage electric screwdriver programmer programmable modular controller for s4 and s5 low voltage screwdrivers there are 5 control options 1 shut off 2 shut off with speed control 3 shut off with speed control and auto reverse option 4 current control with speed control and auto reverse option 5 shut off or current control with speed control and auto reverse options or fastening assurance system the speed control feature allows the speed during the cycle to be controlled in 3 phases 4 with the auto reverse facility speed slow start 20-100 ...