This is an odd one, made by Rock Amplifier Co. in Pomona, CA in the 1970's. Its a solid state transistor amp with a fuzz box type transistor overdrive /distortion circuit. It won't supply the warmth and dynamics for most electric players but it is kind of cool as a second amp for maybe lapsteel on a gig with a mic in front of it, if that's your second instrument?? Or as the delay channel on a two amp set up its cool. There are not a ton of them out there and people collect them. This one used to belong to a member of Tangerine Dream...
https://jedistar.com/rock/
https://www.tdpri.com/threads/rock-amps-petros-1-pics.191667/
We have 1 of them.