It has a padded seat and shock-absorbing seatpost, with a height adjustment. The armrests adjust vertically with a simple grip adjuster. The headrest adjusts manually.
The same lever that adjusts the height (in the canonical way) also allows reclining by sliding it out when not under pressure. Reverse the motion to disable reclining.
The spring which resists reclining is adjustable by a knob below the seat.
This chair helped solve my neck problems, and worked a lot better than some out there for 10 times the price.
FWIW, my $0.02