Two. The 15km transmission length can only be reached underneath the FCC normal when measured in an outside ecosystem with no interference. The SRRC normal is adopted in mainland China, as well as the furthest transmission distance is eight km. Mavic 3M with RTK module for centimeter-degree positioning. Flight control, https://m3mhomes.com/residential/m3m-city-of-dreams-floors-sector-36-panipat/