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see this article
Additional TV subscription no longer required for… | Swisscom Community
It is cheaper and easier than ever to watch TV at your holiday home, with no requirements for an additional TV subscription. Now, all you need is an blue Internet subscription, plus a Multiroom option for blue TV at your second residence in Switzerland.
and this page
blue TV app for PC, tablet and mobile phone | Swisscom
Mobile phone, PC or Smart TV
Best TV experience with the blue TV app
Blue TV on the move with the blue TV app on your tablet, laptop or mobile phone. Or at home on all your TVs with Multiroom.
In your main residence or a second home
Enjoy TV on several devices at the same time with Multiroom
Want to use your blue TV subscription on several TVs and watch shows at the same time? It’s easy with our Multiroom option: install up to five TV-Boxes of your choice or connect your Smart TV.
No costs for Smart TV (via blue TV app)