Model Diameter(mm) Image View Microphone Interface
MD-B20904 Ø3.6x16.3 front view N/A USB 2.0
TD-B20903 Ø3.2x13.3 front view N/A USB 2.0
TD-BL20903 3.2x12 side view N/A USB 2.0
TD-BL20903U 3.2x12 up view N/A USB 2.0
TD-B20908R Ø8.6x2 front view N/A USB 2.0
XD-B20903 Ø3.2x6.4 front view N/A USB 2.0
XD-BL20903 6x3.2x1.9 side view N/A USB 2.0
XD-BL20903S 10x3.2x1.3 side view / single board N/A USB 2.0
XD-BL20903U 10x3.2x1.3 up view / single board N/A USB 2.0
XD-B20904R Ø3.2x1.9 front view N/A USB 2.0