B3000n badge has enhanced noise cancellation and better acoustic echo cancellation during Genie mode or person-to-person calls.
In normal operation, the badge uses an array of four directional microphones. Two at the top and two along the right front side, each with their echo canceller, reducing background noise while you speak.
The following figure shows the primary B3000n microphone and the three noise-canceling microphones.
However, B3000n badges with 4.1 firmware or later, utilize an accelerometer to influence the behavior of the multi-microphone array that enables noise cancellation. For more information, refer to Speech Zone for B3000 Badge.