This is a used Gallien-Krueger (GK) Backline 112 combo bass amplifier in good clean condition. The amp works but requires servicing as internal dust is causing volume break-up. The pots also need a good cleaning. It's rated at 100 watts RMS. Ideal for small to mid-size gigs. There's a line out jack in the back if you need send your signal to the front of the house or other power amp. The amp can be tilted back to serve like a monitor. The amp has a contour switch to "scoop" out the mid frequencies. It's comparable to the Aural Enhancer found on SWR bass amps. The amp has a clean channel and a "dirty" or high-gain channel. The channel can be switched back and forth with an optional footswitch (not included). Any generic A/B footswitch will work with the amp. Includes combo amp, power cord, and original printed users manual.