ACR GlobalFix V5 Cat I AIS Emergency Position-Indicating Radio Beacon (EPIRB), Hydrostatic Release. Including the addition of an AIS alert provides an easy and quick path to rescue, while the included Return Link Service (RLS) functionality provides a welcome sense of security by providing direction to beacon confirmation that your SOS message has been received. Adding a Near Field Communication (NFC) to the mix, allows for your smartphone connectivity and access to data and product interaction. 10-year replaceable battery.