Motorola  Mototrbo PMMN4073/QA02773 IMPRES Remote Speaker Microphone, (RSM). IP55 Rated.  Windporting  with 3.5mm Audio Jack. 

This remote speaker microphone conveniently clips to your front lapel or pocket allowing you to talk and listen without removing your radio from the belt or case.

Compatibile with DP2400, DP2600, DP3442, XPR3300/XPR3500 portable radios.

The IMPRES audio feature optimizes your audio when operating in noisy environments. 

The Windporting feature is specifically designed for windy outdoor environments and dramatically reduces the noise caused by howling winds and harsh weather.