I bought this so that I could tell how many miles I was riding and how long I had been riding while riding. I found it extremely difficult to initially set up even using the instructions. Once I did set it up, it would display my speed while I was riding, but I couldn't get anything on the bottom line to show time or distance, it just blinked the same number over and over. When I got home, I was able to figure out how far I went and the time I was riding, but couldn't figure out how to zero it out for next time. It also kept falling off the bike. The last time I used it, it flew off when I hit a small bump and I didn't even stop to retrieve it.