For multisport athletes who require a wide range of performance information, Helps avoid over or under training by aiding you to train at the right intensity, Measures detailed information about your performance, The Polar Fitness test measures your aerobic fitness at rest and tells you your progress, Comes with Polar ProTrainer 5 software for analyzing, planning and keeping a training diary, Included Polar G5 GPS sensor and Polar IrDA USB Adapter, Dimensions: 6L x 3W x 5H, SKU: SPTMN4676