Two. The 15km transmission distance can only be attained underneath the FCC common when measured in an out of doors ecosystem without having interference. The SRRC typical is adopted in mainland China, as well as the furthest transmission distance is 8 km. Mavic 3M with RTK module for centimeter-degree positioning. https://m3mhomes.com/why-families-are-choosing-smart-world-the-edition-in-sector-66-gurgaon/