The Altair AA108 is durably built and will not break easily. You can count on a solid flight time of around 10 minutes, a bit less when you’re running it FPV. However the 720p camera really works well and connects to your phone through WiFi. It’s easy to fly because it has 3 flight modes, 1 beginner, 2 intermediate and 3 advanced mode. It also has Altitude Hold which allows you to take your thumb off the control and the drone holds it’s own altitude, making it very stable because it’s not bouncing up and down as you try to maintain altitude!
Another big addition is Spark’s obstacle avoidance system. While the ability to sense and avoid objects is usually a feature reserved for larger drones, DJI went ahead and built one into the hull of the Spark. It’s not quite as robust as what you’ll find on the Phantom 4, or even the Mavic Pro, but it still serves its purpose, and helps you avoid crashes.
The maximum distance your quadcopter can cover, and where it can be flown, are determined by its overall weight and size, i.e., the weight after all the attachments or payload have been added. The best drones under $100 usually weigh less than 0.55lbs. Thus, they can be flown in most open areas in the US, except in airports and buildings if you have no license.  
I placed a request on Volunteermatch, where organizations connect with potential volunteers. The link for this is https://www.volunteermatch.org/search/index.jsp?k=drone&searchOpps=&v=false&categories=37&categories=37&s=1&o=distanceBand&l=Seattle%2C+WA%2C+USA&r=20&sk=&specialGroupsData.groupSize=&na=&partner=&usafc=#k=drone&v=false&categories=37&categories=37&s=1&o=distanceBand&l=Seattle%2C+WA%2C+USA&r=20&sk=&specialGroupsData.groupSize=&na=&partner=&usafc=’’ defer onload=’ defer onload=’
If the drone we’re testing happens to have a camera capable of recording, we capture as much footage as we possibly can. We’ll shoot in dark places, light places, and places with lots of color and contrast. This footage is then compared to all the highlight reels that we filmed with other drones, which helps us get a sense of the camera’s strengths and weaknesses. We also test any accessories that accompany the camera, like lenses, filters, gimbals, or FPV goggles. Finally, we’ll also let you know if the camera setup is upgradable, so you wont be stuck with an outdated shooter in two years.
Naturally, there are a couple of downsides to a drone being this small – it’s not particularly happy when flying in breezy conditions and the battery life is barely longer than ten minutes. Still, while the body is made of plastic, it’s tough enough so survive some crashes and, in the right conditions, the Tello is an impressively stable and responsive flyer.
There are various factors you should take note of when shopping for these particular machines. First, you need to check the control operating system to ensure that it’s easy and manageable to use. Basically, there are 3 main control functions you can choose from which include OPTI, ATTI, and GPS, though they all help in flight-stabilization and assistance they tend to do it in slightly different ways.
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