Introduction. The Conceptronic CBTU2 is a Bluetooth USB adapter with Class 2 output power for Windows based PCs. This device can communicate with other. This package contains the files needed for installing the Conceptronic CBTU2A Bluetooth Adapter Driver. If it has been installed, updating. CBTU2A. Bluetooth USB Adapter. Technical Specification Sheet Work as an Audio Gateway (in/out) on PC, with Bluetooth Headset to use MSN, Skype.