Hello Yeecoovi57
Welcome to the SBB Community.
We are a customer support forum run by volunteers.
For clarification, you are talking about the Saver Day Pass. It is valid for unlimited travel on the entire public transit network throughout our country, including the PE trains. It has some limitations on what concerns mountain excursions, whatsoever.
You can find the validity map on the Saver Day Pass product page.
https://www.sbb.ch/en/tickets-offers/tickets/day-passes/saver-day-pass.html
Keep in mind, in Switzerland, greeting before asking a question is considered polite and part of our culture.
Kind regards,
Roland