FEATURES: designed to use for alert search and rescue service at sea. Confirming to IMO and IEC rules, location accuracy within 10m, thanks to built-in GPS receiver used. Automatic release device activated underwater 4 meters. Self-protective device used to avoid possible false alarms. Self-test function applicable. Low-power-comsuption design applied to ensure 48+ hours continous operation. 406MHz transmission together with homing 121MHz.  CCS type approval.