Mavic's Wintech USB Computer goes right from your bike to your PC so you can analyze your day's ride. While on the bike, it shows your preferred data with a big, easy-to-read display. Then, when you get home, pop it into your PC and download all your statistics for analysis. From there, you can customize the screen to show what data you want to see, plot your progression and develop/follow a training plan. The Wintech is all about convenience. You can use it on 2 different bikes and a home trainer, and it automatically detects the sensor and associated bike. The battery is easily replaced, you can mount the Wintech to your bars or stem, and you get your choice of speed/cadence sensors (sold separately).