Dual head and dual mono cab -two of everything: two preamps, both with a built-in booster function that behaves as a stompbox; two effects loops; two power amps; two XLR line outs; and two different-sounding loudspeakers.
Four button footswitch
Five-position amp voice selector, which packs three overdrives - crunch, lead and modern - and two cleans. THR's digital power amp simulation, which in turn has five different valve choices, as well as Class A or Class A/B operation.
On board 'reverb'
USB socket, which lets you hook up the THR100 to your PC to tweak some aspects of the amp from a handy offline editor. Happy for people to come and try. However last chap after he'd finished said his train wasn't for an hour did i mind if he sat and watched TV. I did Guitar World review. https://www.guitarworld.com/gear/review-yamaha-thr100hd-guitar-amp