In a grid-down scenario the pendant automatically boosts TX power from 0 dBm to +10 dBm and shifts to the 868 MHz ISM band (LoRa, 250 kHz BW, SF = 9) for maximum range. A forward-error-correcting codec (Reed-Solomon 255,223) gives 8 dB coding gain, allowing a 50-byte distress packet to be decoded at -137 dBm—roughly 12 km line-of-sight. The message format is compatible with amateur 869.4 MHz simplex and with commercial SAR receivers that support open-standard LoRaWAN—no proprietary hardware required.