FujiFilm X-T2 Owner's Manual page 86

Using a Remote Release
An optional RR-90 remote release can be
used for long time-exposures. The RR-90
connects via the Micro USB (Micro-B)
USB 2.0 connector.
Alternatively, electronic releases from
third-party suppliers can be connected
via the remote release connector. Use
releases with a ⌀2.5 mm connector.
Third-party mechanical releases connect
5
as shown.
66