Superb call quality

BlueVOX QFN-based design includes many novel features that improve headset performance. It supports eSCO (extended SCO), a technology that reduces annoying pops and clicks by allowing lost data to be retransmitted. As a result the design has excellent audio quality, achieving a score of 3.7 in the industry-standard MOS voice quality test*.

This translates into better performance in real-world environments, such as 'cross body' situations where a phone is in a pocket or bag on one side of person, and on the opposite ear.  Or, in an automobile, with a headset connected to a cellphone in a briefcase on the back seat or in the trunk.

*MOS or 'Mean Opinion Score' is a measurement of voice quality on a scale of one to five (five being the optimum). It was originally scored by taking an average of a number of listeners' scores rated as (1) bad, (2) poor, (3) fair, (4) good, (5) excellent.  Algorithms are now used to test MOS quality. All codecs introduce some quality degradation, so a score of 5 is not achievable.