ArticleNo/ P/N:
NNTN8382B
Radiotype: DP3400, DP3401, DP3600, DP3601, DP4x00
AUDIO ACCESSORY-REMOTE SPEAKER MICROPHONE,IMPRES INC RSM, IP57
Speakermic with Industrial Noise Cancelling (INC). INC has 1 microphone picking up surounding noise and 1 picking up audio voice, so you are able to cancel backgound noise.