I purchased this amplifier used. It's a classic from Roland's GA series. It's a bit larger than the GA-20. It's not too heavy, so it might be just right for those who often play live at bars or cafes. It can get quite loud. The scratchiness in the knobs has been almost completely removed. Each part has been cleaned. Compared to the GA-20, the HIGH input setting has a higher gain, giving it a slightly crunchy sound. Using the LOW input allows you to enjoy a clear clean tone (verified by matching impedance). Also, I felt that the gain setting up to volume 1 was a bit high (it seems to stabilize after that). The distortion and reverb have a sound similar to the JC series. The original box and manual are not included; this is just the amplifier itself. Width: 50 cm Height: 50 cm Depth: 20 cm Headphone use has been confirmed. *The operation of the reverb and distortion with a separately sold switch has not been confirmed. *There is a small startup noise from the amplifier when silent, and when the reverb volume is turned up to full, a subtle "hiss" noise from the high frequencies of the reverb unit can be heard. I believe it's within an acceptable range, but if you're concerned, I recommend turning the BRIGHT switch OFF or using the reverb knob at a slightly lower setting. This is a guitar amplifier I really like, but I have another awkward payment coming up this month..., so please consider purchasing it. This is a used item and a vintage instrument, so please refrain from purchasing if you are overly sensitive. This item is not subject to price reduction. Thank you for your understanding. From AI: The Roland GA-40 is a black guitar amplifier with adjustment knobs for volume, reverb, etc. - Brand: Roland - Model: GA-40 - Color: Black - Features: Multiple adjustment knobs (volume, reverb, etc.) - Connectors: Input jacks, output jacks - Handle: With carrying handle Thank you for looking. #I will upload the descriptions of the HIGH input and LOW input to the photos.