Version: Fit 3.0 The Compex Muscle Stimulator Fit: With various training programs. The Compex Muscle Stimulator Fit is available in three fitness series: Fit 1.0, Fit 3.0, and Fit 5.0. The 1.0 and 3.0 models need to be connected using the included electrodes, while the 5.0 device comes with 2 stimulation modules and connects wirelessly to the modules. Electrical impulses are transmitted to the muscles through these electrodes and modules. Depending on how often you train, the Fit 1.0 is equipped with 10 programs, the 3.0 with 20 fitness programs, and the Fit 5.0 with 30 programs. Product details: Color: Blue. Fit 1.0 and 3.0 are wired, Fit 5.0 is wireless. The individual devices include the following electrodes: Fit 1.0: 2x4 electrodes (5x5 cm), 2x2 electrodes with 4 connections (5x10 cm). Fit 3.0: 2x4 electrodes (5x5 cm), 2x2 electrodes with 4 connections (5x10 cm). Fit 5.0: 1x4 electrode (5x5 cm), 1x2 electrode with 1 connection (5x10 cm), 2x2 electrodes with 2 connections (5x10 cm).