The "rescue" figure 8 descender from Climbing Technology of Italy has ears which are designed to prevent the rope from slipping up to the top and forming a girth hitch which can strand the climber until they can remove their weight from the device.
MBS: 40 kN
Material: Hot forged aluminum alloy
Rope capacity: For use with ropes 10 mm to 13 mm
Weight: 250 grams