As a single-output Emergency Locator Transmitter, the Artex ME406P utilizes the same RF output to transmit 121.5 and 406 MHz emergency signals to the Cospas/Sarsat satellites. The ELT automatically activates during a crash and  transmits a continuous swept tone of 121.5 MHz.  During activation, the 406 MHz transmitter sends an encoded 5-watt signal every 50 seconds for 440 milliseconds to alert Search and Rescue.