Many users value the extra peace of mind of having a panic-brake function. Feedback gathered from highly qualified and experienced ‘Pro’ users highlighted a demand for a device which does not incorporate a panic-brake function. Enter the D4PRO! The ISC D4PRO Work/Rescue Descender is the same great Work/Rescue Descender, but without the panic brake. This can be particularly useful on longer descents and in rescue/belay applications, where a broader ‘sweet spot’ is welcomed. As the D4PRO does not incorporate a panic-brake, it is not possible for the device to fully meet the criteria of NFPA and ANSI Standards. The D4PRO is fully certified to EN 12841 (a panic brake is not a compulsory criteria of this standard). Meets NFPA 1983. NOTE: As the D4PRO does not incorporate a panic-brake, it is not possible for the device to fully meet the criteria of ANSI Standards. The D4PRO is fully certified to EN 12841 (a panic brake is not a compulsory criteria of this standard). If you require a Descender which fully meets NFPA/ANSI standards, please see (HD26268R) D4 Work/Rescue Descender with incorporated panic-brake.