1/0.1 watt DSL head. Modelled after the DSL line from the 90's. 8/16ohm. Made in UK in 2012. Sounds great. JJ tubes, includes original tubes as well. Has a line out on the back so you can practice silently (you can plug in headphones too, but its mono so you need an adapter.) It's quieter but still get quite loud especially through an efficient speaker.. Little known but awesome fact about the 50th anniversary DSL1h (and the JVM1h, only those 2 as they had the same designer) they are designed in such a way that the output from the speaker jack is safe to plug into another pedal (use a standard patch cord rather than a speaker cable in this case), FX return, etc. So the whole head can be used as a preamp or plugged into other pedals. This was confirmed by the man who designed the DSL and JVM 1 heads for Marshall. Excellent condition, comes with the footswitch, power cord, extra tubes, and paperwork.