Applying the BTL circuit could generate higher output (2.5 W) than the other similar products (less than 1 W)
LED, Head Phone Jack can be installed without any additional parts.
Trimmer controls the gain in a low frequency range, allows you can control Clean and Heavy drive sound.
The Power on/off push/pull switch volume and the SMT (Surface Mount Technology) take up very little space to make installation easy.
Various version for the various installation.