The interfaces of the Ehong Bluetooth Evaluation includes: USB Huber (USB to UART, USB to Bt module), USB to UART,
3.5mm jack audio input/output, several buttons, LEDs. It is a completed environment to evaluate Ehong's Bluetooth module.
With different adapter boards plugged in the socket, all Ehong's Bluetooth modules can be evaluated with the same EVK board.
And there're mounting places reserved on the EVK board for soldering the Apple's authentication coprocessor (2.0B or 2.0C).

So it can also be used as a demo or test platform of Ehong's iAP over Bluetooth solutions.

The EVK board also has SPK_OUT and MIC_IN jack. There's audio amplifier converting the differential audio output from the
Bluetooth module to single-ended, which can be output directly to a common 3.5mm headphone. And with on board MIC bias
circuits, a microphone can be inserted directly