I had a Jawbone up 24 and it went unresponsive . I tried to troubleshoot the problem with no luck. I called customer service and they replaced my device free of charge with a model newer because they don't make the 24 anymore. I now have an Up2 and love it. I didn't need a heart rate monitor one because if I were interested in the feature my phone can do that. At $79 retail is a great device. Highly recommend for the ocerall, but company baked their product 100%.