The ARVA 9000 is an older avalanche transceiver that was discontinued in 2001. ARVA is a French company and at the time of the ARVA 9000, they didn't have a large distribution network in the United States.
Summary: This is an interesting beacon in that it has one antenna, yet the audible tone is digital. The tone increases in both cadence and pitch as you near the victim, and the screen displays digital numbers. Read more about audio feedback here. The 9000, like many of the ARVAs, is large and bulky.
Although I have only done moderate testing of this beacon (and it was discontinued many years ago), the ARVA 9000 appears to be one of the most capable of the single-antenna transceivers I have tested (i.e., the long range you would expect from an analog beacon and the best audio and visual indicators of the analogs).