To use all the Bluetooth features of the USB Host Shield library a proper USB Bluetooth V2.1+EDR dongle is needed.
Unfortunately a lot of the cheaper Bluetooth 2.1+EDR dongles from China is either of bad quality with lose connection or not supporting the promised EDR functionality rendering a lot of the PS3 features unusable (R2, L2, Accelerometer etc.)
The Bluetooth dongle provided here is specially tested and confirmed working as V2.1+EDR dongles. This means the dongle has been tested with both PC and most importantly the USB Host Shield to confirm the very specific EDR support as used with PS3 controllers.
OBS. These are the same dongles being sold bundled with our Balanduino kits!