HD video starts at the resolution of 1080p as a minimum. For all of these drones, the video is captured at the lower resolution of 720p, even when they claim to have HD cameras. The resolution of still images is always higher than the video. With still photos, the resolution can be as low as 1 megapixel (equal to 1000p) and that resolution is considered HD for still photos.
Headless mode is another prerequisite feature for your dream device. Also referred to as cheater mode, the headless mode allows you to direct the drone to see any direction it goes as forward. Thus, you do not have to bother about flipping it around and bringing it back to your location at the end of a flight. Once the headless mode has been activated, simply push the joystick in the corresponding direction you want your device to move towards.
As mentioned above, you will crash, and you certainly don't want to go home empty-handed. Having back-up propellers can make or break your day. Extra batteries are also a must. Current battery chemistry limits flight times to somewhere between 5 and 25 minutes for most amateur drones. Having plenty of charged spares means you can fly longer — though flying for more than 30 minutes straight can be fatiguing.
Generally speaking, drones that cost less than $100 bucks aren’t worth your time. They’re flimsy, they lack advanced features, and they’re almost always squirrely as hell in the air. But Tello is different. Despite the fact that it retails for only $99, it boasts a boatload of high-end features and functionality. Under the hood you’ll find a 14-core Intel vision processing chip, flight stabilization tech from DJI, a 5 megapixel camera capable of shooting 720p HD video, and a battery that gets you 13 minutes of flight time.