Pixfalcon, M8N GPS, 4S PDB Advanced Bundle Adavanced Autopilot Bundle system with GPS and PDB Follow me Technology: By adding our telemetry radios you can have your drone follow you. Advanced GPS flight mode: RTL, Position Hold, Loiter, Circle, Follow, and many more options. This is the most advanced Flight Controller available for its weight and size With new lightweight design, this is Ideal for 250mm racer drones