AMT do fine work, those Russians know their stuff. This is an amp sim pedal, styled after the Fender Twin. It's got an effects loop, as well as capacity to add a distortion pedal in a separate loop as a gain channel. It runs on 12v power, but will take 9v okay, and has a power output to send volts to your other pedals if you're into that. Clever stuff.

Model: AMT Electronics Legend Amps F1 Guitar Preamp
Made: Russia, recent model
Serial: 10314052133506
Type: pre-amp/DI
Power Input: 12v DC centre-negative supply (not included)
Accessories: none

Condition notes: used, no major marks. Tested and fully functional.
Overall: very good condition (8/10)