Wahoo Fitness - Bike Pack for Apple® iPhone® 3G, 3GS, 4 and 4S - Black

This was a great purchase and makes exercise more fun!! We ride every week and now we don't have to guess how many calories we burned and how far we rode.

I can't begin to tell you how great a product this is. I have both the bike kit accessory and simply the little adaptor by itself that I simply attach when I go running or hiking. It's also compatible with Gamin accessories as well. (bike Cadence and Speed/ Heart rate monitors) Ant+ power meters and such as well. It brings a whole new level to fitness and training allowing me to use to track all kinds of information and sharing or challenging other people with online. I use the MapMyFitness App with it and it tracks and updates me with a weekly recap on my progress. Come check it out... Once you get it and start using it, your never train or keep track with anything else. New feature through the MapMyFitness is real-time tracking on it, if your racing and friends have come to support you, they know where you are at on the course at all times. Or if your just out training your Wife/Husband knows where your at as well.

Recommend! We can see everything: heart, speed, cadence, calories, gps, etc... But It's a little big case for the bike...

I can't really give this a valid review, because the package I got (which appeared to have been opened before, although I was assured it was not) was missing a couple of parts. From what little I could see, though, the mounting seems fussy. No opinion on how well it works because I didn't get that far.