Foot operated speed control comes in a heavy, cast iron metal housing and the extra weight provides added stability and control. It features the same durable, solid state electronics as the C.TXR. The ergonomics allow precise and reliable speed control with your foot. C.SXR-1 has special electronics that converts AC current from an electrical outlet to DC current- the type required by the motor. It also has a special plug that fits the motor's shielded plug. For use with 115 Volt M.TX, M.TXB, M.TXH, M.LX, M.LXB, M.LXH and M.LXBH motors. 7” long, 5” wide, 2-1/2” high, packaged wt-6 lb/2.7 kg, 4 Amps, 60 Hz It is interchangeable with Foredom's C.TXR-1 and C.EMX-1 controls.