The STC40 is a power supply that operates with select Mountz electric screwdrivers. It is single tool controller that is designed to operate at either 110v and 230v. The unit is can connect with the Scout screw counting system. Operates with Electric Screwdriver Models: LF-Series, BF-Series and NF-Series. The program lock key is required for the BF and NF-Series Standard models and Soft Stop models. RPM & Soft Start Settings can not be adjusted without it.The program lock key can not be used with Plus models of BF, NF-Series and Soft Stop models and Angle & Auto Reverse models. Model:STC40 Tool Weight:1.8 lbs. Tool Length:7.5 Tool Width:4.375 Tool Height:2.375 Maximum Output:10A Output VDC:30/40V Input VAC:110/230V