Luckily I have found when searching this speaker. The size and weight are OK - you can simply pick up and do not even need a socket for almost 3 hours.
The link to the tablet works very well - Range approx 5-7 meters with 3 walls between them - better than I expected. The built-in speakerphone I have not tested. The best thing for me is the possibility via Aux-out (3.5mm jack) to connect the speakers to my amplifier. In this case, the internal speaker is muted. I wanted to have.
The sound is, as expected, OK - but not really comparable to a JBL dock. Therefore only 4 stars (because it could be still better).
From price Leistungsverhältinis ago the small cube is really great - the money is very well spent. Quasi a small cube.