It's a Zephyr bluetooth. Only had it for a week, and it's been great so far.

http://www.amazon.com/Zephyr-Bluetooth-Wireless-Android-Windows/dp/B002PL33AQ

I use it with Endomondo.

It's a Zephyr bluetooth. I didnt realize how much fun it would be to see the data. Kinda motivates you to go collect more.