The D4 is a double-stop device with an auto-lock function (which is activated whenever the operator lets go of the handle) and a panic brake which is not overly sensitive in normal use.
The D4PRO Descender is the same great Work/Rescue Descender, but without the panic brake.
RIG is a compact self-braking descender designed for experienced users. It has an ergonomic handle that allows comfortable descent control.
I'D S is a self-braking descender with anti-panic function for work at height and rope access work