Review on JGRZF Bike Computer: Wireless Speedometer and Odometer with Backlight, Waterproof LCD Display – Ideal for Outdoor Cycling and Fitness (Wireless Computer) by James Davis

Large size for easy reading. I like the rotation on the mount which unlike sliding mounts is unlikely to lose holding power with use. Two small disadvantages: (1) Driving time, driving distance and average speed cannot be displayed at the same time. I expect everyone to have their own favorites, but I would obviously prefer average speed to calories (which must be very inaccurate as the device doesn't have the information (power) needed to calculate them). (2) Just because you *can* do something doesn't mean you *should* do it. When the clock is not in use, the display not only shows the month, date and time, but even the year. Since most people are in this mode at least 90% of the time, each digit you see decreases battery life a bit, and if you can't remember the year, it might be time to get rid of your bike keys. Update: Potential The "small problem" I mentioned in my original review turned out to be a big problem. I went to the computer after not using it for about a month and found that the battery was completely dead and the device had lost all my data (mileage, settings). I'm lowering my rating because if a product doesn't get the basics right then all the other features aren't very useful!