Bearing in mind that we are talking, more or less, of a toy, i must say that, for the negligible cost it has, it works very well. Enough volume of the speacker to listen to the songs. With the appropriate keys, placed above the speacker, it is possible to vary the listening volume, go back and forth with the songs, connect to the microphones, vary the colours of the lights in front and drive a possible microsd (to be inserted on the back of the speacker. On the microphones there is the on/off button, the + e-keys for the volume of the only � � � � � � And a key to vary some audio effects for the voice and, extraordinarily, the system of eliminating the sung from a piece of music, so that it can be used as a karaoke. Obviously the speacker can connect via bluetooth to an external sound source, see smartphone, tablet etc. . . What can i say. . . Great pastime for parties.