It is a radio distress signal transmitter operating on two frequencies, 121.5 MHz (monitored by commercial aircraft) and 243 MHz (monitored by the military).
Luphawu lukanomathotholo olusebenza ngendlela ezimbini 12, 5 MHZ (Igadwe ngonobhizinisi benqwelo moya) ne243 MHZ (Egadwe ngabomkhosi).