ACR GlobalFix V6 EPIRB. Uses 406 MHz satellite connectivity to transmit emergency signals to the global Cospas Sarsat satellite rescue system. The distress transmission relays the GPS EPIRB (GPIRB) position, accurate to within 100 meters. Also transmits a 121.5 MHz homing signal to aid rescuers in finding the device. Return Link Service (RLS) confirms that the beacon has successfully sent the distress message and that this message has been received. Near Field Communication (NFC) allows the beacon to connect to a smartphone for quick diagnostics that demonstrate the battery is charged and the EPIRB is functioning properly. Category I (hydrostatic release). 72 Channel Multi-constellation receiver (GPS, Galileo, & Glonass GNSS). 10-year replaceable lithium battery. Cospas-Sarsat, FCC, RED, Canada ISED approved. 5-year warranty. 18.5" x 4.3" x 4.36".