A simple 2 watt solid state board with 2.5 inch oval speaker recycled from a desktop computer. Grill recycled from old computer speakers and free cigar box cabinet spattered with internal computer hard drive parts and a video GPU processor. It sounds very cool at conversational room levels without blasting anyone. My buddies jam on these low wattage amps while our wives talk with each other in the same room. I love not monopolizing the room in that way but also everyone being together. Also, there is a balance between the acoustic properties of the cigar box guitar inself and the low volume of the amp if you place it just right, distance wise. No two sound the same due the using different cigar boxes and depending on if you open or close the box while playing (closed produces more bass, open more treble or cut).