The standard, no frills belaying device from CAMP. It doesn’t get any lighter (except if you skip belay devices altogether and use an HMS). I learned to belay and rappel with it and used it for many years (also using a Cassin plate to belay seconds). Recently I replaced both with a TRE, but I still use it for canyoning or really low temps. It also comes handy when friends want to try climbing for the first time (my old harness also helps here).
Pros: Really cheap Really light Easy to use even with the thickest gloves Works with a very big range of rope diameters Can rappel over knots (useful for bailing using two ropes tied together or a damaged rope tied off)
Cons Kinks the rope (not as much of a problem with singles as with doubles) Can rappel over knots (like the one at the end of the rope. Use backup)