Very good sound, inexpensive battery case

The sound is quite good and the size appropriate (see the other reviews). Is surely clear that one can not expect a hi-fi sound for the size.
Really bad but the attachable battery case: It is - unlike the actual metal speaker tube - made of plastic and has total fiddly terminals, the break with the first falling down. Then helps only rubber band or tape to attach the battery compartment on the device. This happened to me after a few weeks.
With a portable device, which is often taken and certainly has to withstand even minor nudges and falls, this is totally annoying! It degrades the device for disposable articles!