The Removu K1 officially supports the first party Removu External Microphone for K1. It can be purchased with the K1 Accessory Kit or separately. Please contact support to seek assistance where to purchase the microphone.
Although the external microphone 3.5 mm jack has stereo connections, the K1 does not record audio in stereo due to hardware limitations. The power output for the microphone jack is 1.0 volt. To adjust the external microphone settings, please go to "Menu > Camera Settings > Ext Mic Volume". The higher the "db" value, the more and louder audio the microphone picks up.
If the recorded audio from the external microphone picks up static noises, we highly recommend to update the firmware to the latest version and make sure the battery is charged above one bar.