Feature:
Motorola RMN5127C IMPRES 4 Way Navigation Keypad Microphone with Enhanced Audio.
A four way navigation button makes it easy to navigate the full color display and a full keypad enables you to enter text messages and dial numbers from the microphone.
Plus 3 programmable shortcut buttons enable easy access to various control head features.
This microphone features IMPRES audio which suppresses ambient noise, improves voice intelligibility and amplifies loudness, which makes it easy to hear over road noise and rumbling trucks.

This item RMN5127C is replacing RMN517A