Gasflow,
The Artex B406-4 Emergency Locator Transmitter (ELT) system consists of the ELT transmitter installed in the aft overhead cabin adjacent to the ELT antenna on the upper aft fuselage. Connected to the ELT transmitter is a programming dongle. Finally, a Remote Switch is installed in the cockpit to control the ELT system.
The ELT automatically activates during a crash and transmits the standard swept tone on 121.5 and 243.0 MHz. It also transmits a 406 MHz encoded digital message.
ActivationAutomatic by 4.5 feet per second (2.3 G) Primary G-Switch or Manual
https://www.cobham.com/media/185117/...e%20manual.pdf
It stays with the airframe. Have a read of the AF447 thread...
Try google.com. It is a search engine.