The CAMP Yo-Yo Locking Belay Device is a type of descender used for climbing and rope access. It is a self-braking device designed to provide control during descent. This device is suitable for rock climbing, rescue, and other rope-related activities. It is made of hot-forged aluminum magnesium alloy. This device is designed for use with ropes of a specific diameter, with the package indicating a range of 10mm to 11mm.