Jawbone recently announced and launched several new fitness trackers. I have to admit that I'll miss the older, simplistic design of the original Jawbone UP since it didn't require a clasp or buckle to stay on your wrist. The newer models all use some type of clasp so that you can adjust the size and keep the tracker secure on your wrist.
The new models are:
UP2: thinner, lighter than the UP24
UP3: includes advanced biometric sensors that measure heart rate
UP4: includes mobile payment capabilities through American Express
Jawbone UP connects and integrates your fitness data with MyFitnessPal (now a part of Under Armour).