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The Sennheiser MKE 400 on-camera shotgun microphone is a high-quality, compact alternative to using the built-in microphones on DSLR cameras. Offering an all-metal housing, maximum side noise rejection, switchable sensitivity, integrated shockmount, and foam windshield, this little microphone is one of the most versatile on-camera solutions out there. This unit runs on 1x AA battery.
https://blog.lensprotogo.com/2016/08/28/lavs-vs-shotgun-mics-3/
Batteries not included. Speaking of batteries: