Regarding Mark Drone..
VIO technology positioning: No limited to the GPS signal and anti signal interference, Mark is with VIO positioning mode to easily achieve precise and stable indoor and outdoor hovering.
Remarkable Memory: Mark can identify and record the trajectory it flied easily for remarkable memory.
4K HD Camera with Quickshot, gesture shots and video, panoramas. So MARK is more interesting photo functions.
Visual Tracking: Rocket, to ascend with the camera pointing downward; Circle around the target; Dronie to flying with the camera locked on your subject; Helix to fly upward, spiraling around your subject.
Foldable & Portable: Well-designed propeller storage jig allows the body to be tidy enough so that it will not be twined by other items even it is placed in a pocket or handbag.
This thing is pretty unbeatable at this price.
Thank you for showing me will absolutely be a buyer.