Automatic belay device.
Typical use: one climber and one belayer.
Installation at the top of the track.
Simplifies belaying, suitable for young and novice climbers.
Incorporates a braking system with automatic locking (acting as a fall arrester).
It eliminates the risks associated with human error (poor manoeuvres, inattention of the insurer, etc.).
Does not require a harness for the insurer.