Cirrus SR22 Pilot Operating Handbook page 342

Section 9 Cirrus Design
Supplements SR22 / SR22T
Section 1 - General
The 406 MHz emergency locator transmitter (ELT) is a radio-
frequency transmitter that generates a signal to assist in search and
rescue for missing aircraft. The ELT automatically transmits the
standard sweep tone on 121.5 MHz if rapid deceleration is detected. In
addition, for the first 24 hours of operation, a 406 MHz signal
Figure -1
Artex ME406 ELT System
2 of 8 P/N 13772-131
Revision 02: 01-06-10