The range is within 10 meters announced. It is even a bit more than with my phone a Wiko Cink Peax II. Can be a bit more micro cuts when I'm distance limit and I move my head. Transmitter ground floor and 1st floor me upright. But nothing danormal !!!
I tried to use it while charging the battery, it works the other hand red light indicating that load goes out ... I think it load anyway, there is nothing in the above instructions. By the way, it is in French and fairly detailed.
I'm pretty happy with my purchase. If cétait again I'll take the same.