Hallo Whasouphiss77
I see. It is the full fare Saver Day Pass.
This is the map:

It is valid on all red, yellow, and black solid lines.
In other terms:
- Interlaken to Grindelwald
- Interlaken to Lauterbrunnen - Wengen
- Interlaken to Mürren.
It is not valid to on Grindelwald/Wengen to Kleine Scheidegg or Jungfraujoch.
As a rule of thumb, the Saver Day Pass is valid to inhabited places where the Swiss do live on 365 days. In addition, it covers a few mountain excursions such as Mt. Rigi, Mt. Stanserhorn, Klewenalp, Stoos, and Rochers de Naye.
Kind regards,
Roland