BREAKTHRU HYDROSTATIC RELEASE KIT FOR EPIRBS 'BreaktHRU' ù the new Hydrostatic Release (HRU) Kit from McMurdo. Smaller than other HRUs currently available, BreaktHRU is unique in its use of a small pyrotechnic charge, which is used to enable EPIRBs to automatically float free. Using technology developed exclusively by McMurdo, the pyrotechnic charge is used to activate the HRU when it is submerged in water less than 13 feet. Once activated the liferaft or EPIRB is automatically released -- itÆs as simple as that!!Weight: 2.82 oz Operating temperature: -22¦F to 149¦F Key features:ò Compact ò Classified non-hazardous ò Complies with the latest SOLAS and IMO resolutions ò Fits the footprint of existing HRUsò Competitively priced ò Service life of two years