This is the Analogman Beano Boost, a simple looking yet effective pedal.
This pedal is based on the 1960s British Dallas Rangemaster, which was best at the time to give a treble and gain boost to the dark British amps. This allowed them to get a sound more in tune with the time, as guitars were starting to become a loud, bold, lead instrument. This pedal is a type of BOOSTER, not really a distortion pedal nor a clean boost- it does modify your sound quite a bit. It excites certain frequencies and pushes your amp to allow it to create rich tube distortion. The pedal colors your tone, with a crunchy overdrive, boosting certain frequencies, and warming the tone with NOS germanium transistors. It does not have a lot of compression and sustain like most OD pedals, but a more raw, open sound.