[Samuel_Michon]

Interesting. Assuming the device has only Bluetooth 4.0 and not 2.1 or WiFi, then the only iDevices that would be compatible are the iPhone 4S and later, iPod touch 5th gen, iPad 4, and iPad mini.

Given the limited number of compatible iDevices, it might be prudent for Apple to hold out launching this snap bracelet device, at least until they launch the next generation of iPhones and iPod touches.

[allwein]

It might be a limited number of models, but there are more iPhone 5's and iPhone 4S's than all of the previous iPhone models combined.