Foot operated speed control is made of heavy duty plastic with durable solid state electronics. The ergonomics allow precise and reliable speed control with your foot. C.TXR-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. 7-1/4” long, 4-1/2” wide, 2-1/2” high, packaged wt-2 lb/1 kg, 4 Amps, 60 Hz It is interchangeable with Foredom's C.SXR-1 and C.EMX-1 controls.