This is a G-15GK guitar amplifier.
It is a practice amp with an output power of around 8-15 watts.
It includes both a clean channel and a distortion (overdrive) channel.
It features tone and volume controls, as well as a headphone output for silent practice.
The controls visible on the front panel include Input, Gain, Tone, Volume, Over Drive switch, Head Phones jack, and Power switch.