Nux Fireman is a pedal, it has two channels with separate controls for volume and gain.
Channel 1 has a slightly warmer and crunchier sound, Channel 2 is punchier with more bite.
NUX has 2 independent gain, volume knobs.
Length 10.5 cm, width 11.5 cm, height 5.8 cm, price around 120 €.
I have other distortions and they are warmer, have more chunkier sound quality, I would say that Fireman different.
Image: photography from my LG Q7