Good, sonorous speaker with future warranty

I have the Wavemaster MOBI mini speaker system bought black because I was looking for a speaker for the road, which is operated on the one hand with batery, to various devices, such as on my iPhone, my laptop or connect similar can. Moreover, it was important to me, that is enough, the device future standards (anyone who has bought a stereo with Apple 30-pin connector is probably angry now, has come out since the Lightning connector).
One criticism, however, there: The connection cable is very short (about 10cm).
The sound quality I was surprised at the beginning extremely positive. I think for 20 can not otherwise expect so much!
My Applications:
I am a teacher and was tired of always having to rely on too quiet reproducers, therefore I close always the Wavemaster MOBI Mini Speaker System black on my notebook. The resulting volume is more than sufficient!

Therefore, I forgive for Wavemaster MOBI Mini Speaker System black full marks.