Great little amplifier with small dimensions. The connection is child's play of the hand and the sound quality is for this little amplifier without many parts very well. The IC is not very hot even after prolonged use. Of course, this also depends on the music style. Also at higher volume the amplifier operates even without audible distortion / clipping.
An on / off switch would perhaps have been preferable, on the other hand he can be so easily solder in the supply line.
The amplifier is well suited because of the price and the dimensions of mobile speaker, since the IC may not eat as much electricity.
