DJI Phantom 4 review: lightyears ahead of its predecessors
Amazon.com: Release and Drop Professional Device for DJI Phantom 4 (all models) – Drone Fishing, Bait Release, Load Delivery, Search and Rescue and Fun – U.S. Patent - by DRONE SKY HOOK :
WM332A1702 Phantom 4 Advanced User Manual SZ DJI TECHNOLOGY