"THREE FREQUENCY SINGLE OUTPUT EMERGENCY LOCATOR TRANSMITTER; THREE FREQUENCIES USE THE SAME BNC RF OUTPUT CONNECTOR; AUTOMATIC ACTIVATION VIA 4.5 FT PER SECOND 6 AXIS G-SWITCH OR MANUALACTIVATION; TRANSMITS STANDARD SWEPT TONE; THIS TRANSMITTER HAS THE HM OPTION INCORPORATING A 6 AXIS G-SWITCH FOR HELICOPTER INSTALLATIONS, USES 5 YEAR LITHIUM BATTERY; 5 AREA SELF TEST; 3 WAY REMOTE CONTROL, WEIGHT 4LB 10OZ"