Very good sound for the 500 crowns that cost handsets. Decent range, go through two walls at home (plaster) without losing the sound. Long battery life. They have been running one at 11h at the most, after it becomes headphones sensitive to movement and things that can block the signal, for example walls. The only downside for me is that it will make a slight noise in the headphones at peaceful parts in film and music. Apart from that, good headphones.
Worst crap I've bought all my life, linking up and down at irregular intervals to completely stop functioning for 15 minutes or more and then start work half an hour back.
It did not matter if I had them connected to your tablet, phone, or computer, the problem with all.
In the end, I was so angry that I stomped down the judgment.
The sound was mediocre.