Want to learn more? This is a great book.

Ortovox M1 Avalanche Transceiver Review

The M1 was released in 1998 and discontinued in approximately 2000. See the review of the M2 for a similar Ortovox analog transceiver.

Model:  M1
Manufacture:  Ortovox
Retail Price:  Discontinued
Type:  Analog (mostly)
Antennas:  1
Marking:  No
Updateable:  No
Owner's Manual:  N/A

Pros: Long range. Excellent analog transceiver.
Cons: Many (e.g., no direction indicator, can't handle spikes, etc).