Two. The 15km transmission distance can only be realized underneath the FCC standard when measured in an outside surroundings with out interference. The SRRC standard is adopted in mainland China, plus the furthest transmission length is 8 km. Mavic 3M with RTK module for centimeter-level positioning. Flight Command, the camera, https://m3mhomes.com/residential/m3m-golf-hills-sector-79-gurgaon/