All avalanche transceivers work on the same 457khz frequency. There used to be a different standard - 2.275khz - and during the transition, things got a little screwy. However, the International Commission for Alpine Rescue adopted the 457 standard in 1986 and ASTM adopted it in 1996. Every beacon sold since 1996 sends and receives on the 457khz frequency.

You may encounter a dinosaur who refuses to give up his old, 2.275khz beacon. That person is a moron and you shouldn't ski with him.