Question: What does the Remote Controller Microphone (MR-12) do?

The Remote Controller Microphone (MR-12) is a combination monaural microphone and controller that can be used to control the operation of the DS-2200 from the MR-12 itself. It can be used to control recording and playback functions and also to turn off the DS-2200 using its HOLD switch. It also features a 3.5mm earphone jack and a clip to secure it to clothing.
Verification Source: Olympus Website