IP55 is waterproof and dustproof enough to meet the hardware requirements in harsh communication conditions, intelligent noise reduction can maximize call clarity, and the 2900mAh ultra high performance large battery cell is sufficient to support ultra long communication times. GPS/Beidou positioning services can confirm location information in real-time and record communication location trajectories. The all-network communication GC619 with multi-mode configuration can use analog or digital signal calls in the public blind zone, or can serve as a relay mode and self-organize a small cellular network.