I had a Fitbit Flex but found I couldn't set the alarm or make any changes unless my smart phone had an internet links to the Fitbit server. I checked Fitbit's web site and people in the Navy, on cruises, hiking in the wilderness etc couldn't use their Fitbits because they didn't have phone coverage. Fitbit has know about this issue for over 2 years and has done nothing about it. So I went searching for a replacement. The ID107 HR cost me less than $30 and does everything the Fitbit Flex did and even more and so much easier to set up with the smart phone app. However it doesn't integrate into other apps, nor can you share your info with friends.