Bluetooth 2.0? Why not 4.0?

Great question. It’s a little confusing due to the Bluetooth version numbers and what they imply. Bluetooth 2.0, or Bluetooth Classic, is what has been used in wireless headsets, portable speakers, and many other high-datarate applications. Bluetooth Low Energy, or Bluetooth Smart, is a low-datarate special purpose wireless protocol that was added to the Bluetooth spec in Bluetooth 4.0. Often when products use Bluetooth Low Energy they say it uses Bluetooth 4.0. However, we wanted to be clear that we are using the high-datarate part of the Bluetooth spec so state we use Bluetooth 2.0.