DS/ETSI EN 300 718-1 V2.2.1 (2021-06) - Avalanche Beacons operating at 457 kHz; Transmitter-receiver systems; Part 1: Harmonised Standard for access to radio spectrum
Tracker100 Technical Report
Ortovox Avalanche Rescue Transceiver F1 focus 457 kHz Made in Germany | eBay