Two. The 15km transmission distance can only be realized under the FCC typical when measured in an outside environment with no interference. The SRRC regular is adopted in mainland China, plus the furthest transmission length is 8 km. Mavic 3M with RTK module for centimeter-stage positioning. Flight Regulate, the digicam, https://m3mhomes.com/residential/m3m-industrial-plots-sector-9-manesar/