This is the BOSS Katana-Mini, an ultra-compact guitar amplifier that delivers big tone in a small package. It features a 4-inch speaker and three amp types: Brown, Crunch, and Clean, providing a versatile range of sounds from clean to high-gain.

The amp includes a 3-band analog EQ (bass, middle, treble) and a built-in delay effect. It can be powered by six AA batteries or an optional AC adapter. The auxiliary input allows you to play along with external audio sources, and the headphone output features cabinet emulation for silent practice.

Condition is good and it works well, as stated in the original listing.