In order to create the best user experience, Nike leveraged technology (Bluetooth LE) that enables a seamless automatic sync between your Nike+ device and your mobile device. This type of sync requires both a Nike+ device that can sync via Bluetooth LE and an Android handset that can run an operating system that supports Bluetooth LE syncing.
Given these requirements, we opted to focus our development on the Nike+ FuelBand SE and Android handsets capable of running Jelly Bean 4.3 and above.
For a list of optimized handsets, please see our "What do I need to use the Nike+ FuelBand App for Android?" FAQ.