UHF range is ~6-8 meters (20-26 ft) line-of-sight, but metallic surfaces reduce it by 50%.
The ST102 features a powerful 2D imager (Honeywell N660X or similar). Unlike consumer phones, it requires enabling the service. BLUEBIRD ST102 tutorials
Never interrupt this process – a corrupted bootloader can brick the ST102. UHF range is ~6-8 meters (20-26 ft) line-of-sight,