"The BH Fitness Khronos Cross Trainer is built to withstand light commercial use, is self generating, has electromagnetic resistance and is supplied with a chest strap for heart rate control. The BH Fitness Khronos Cross Trainer is a fantastic cross trainer that is designed to withstand long, frequent training sessions. It has a great range of features and functions and is perfect as either a standalone item of equipment or as part of a high quality home gym. Main Features: - Self Generating - No need to plug into the mains ElectroMagnetic. - Resistance - Responsive, non-mechanical resistance for an authentic "gym" feel Unique Footplate design."