Two. The 15km transmission distance can only be realized under the FCC typical when calculated in an outdoor natural environment without having interference. The SRRC typical is adopted in mainland China, and also the furthest transmission length is eight km. Mavic 3M with RTK module for centimeter-degree positioning. Flight Handle, https://m3mhomes.com/commercial/m3m-paragon-57-sector-57-gurgaon/