Step 1: External Bluetooth Adapter
First, obtain your BTA II. Got it? Cool. Now use your thumbnail to pop the cover off. You'll see a battery, a circuit board, and the coiled wire that connects to your cell phone. Three wires connect the wire to the circuit board, on mine they were colored white, red and black. The white is +microphone, the red is +speaker, and the black is the common ground. De-solder these wires after carefully noting their orientation.