The CRD descender has an integrated special gear unit with a hand lever. This can be used to lift an unconscious persons without any additional help, e. g. from the driver‘s cabin of a crane. When lowering a person, the CRD („Constant Rate Descender“) automatically ensures a constant, defined descent rate. Therefore, you can save individual persons from a height of up to 400 m. In the event of an evacuation, the CRD can also be used by multiple persons in quick succession. Because the device is designed to bear a maximum load of 225 kg, up to two persons can be returned to safety at the same time in an emergency.