cross-border obstacle avoidance optical flow positioning hd dual-lens aerial photography folding remote-controlled unmanned vehicle primary school student four-axis aircraft

y76 (battery 1) y76 (battery 2) y76 (battery 3) y76s (battery 1)-2.4-inch screen y76s (battery 2)-2.4-inch screen y76s (battery 3)-2.4-inch screen y76d (battery 1)-4.3 inch screen y76d (battery 2)-4.3 inch screen y76d (battery 3)-4.3 inch screen

original standard