This format, storing data on DAT tape, has quite long history.
It was one of the first using helical track scanning, allowing
to increase density on 3.6mm tape. In 1989, first DDS (as
Digital Data Storage) units could store up to 1.5GB on a single
tape. Newest ones can store 36GB and more.
There are a few formats which are not interchangeable and partially backwards-compatible, as they use different track widths and lengths (see here).
These streamers usually have 2 LEDs (tape status/operation and cleaning indicator) and eject button.