Motorola AAM24X501 Remote Speaker and Mic for EVX-S24 Radios

The AAM24X501 is Motorola's compact speaker microphone for the EVX-S24, listed in that radio's own specification sheet under audio accessories as the MH-90A4B.

A remote speaker microphone moves the speaker and the push-to-talk up to the shoulder or lapel. The radio stays holstered and the user stops reaching for their hip to answer, which is the difference between a radio that gets used and one that gets left in a drawer. The word compact is Motorola's own and it is the point of this particular unit on a radio chosen for being small.

Motorola lists other audio options for the same radio in the same table, including the MH-89A4B earpiece microphone and, where water is a real risk, the MH-66F4B IP57 submersible speaker microphone. This one is the everyday choice.