... Escape descent device factory. 2.For fire occurs. 3.For emergent escape from high building. 4.Easy to use. JSH-100/35-20 DESCENT ... RESCUE DEVICE1.Applications The JSH-100/30-20 be used for emergent escape from high ... The main structure: safety hook ,speed controller, descent rope, safety belt, rope reel 3. Main parametersMax ... rope breakage, must replace promptly FIRE DESCENT CONTROL DEVICE