There are two basic drone design -fixed-wing units with a brushless electric motor and a rotor type that has between three and eight or more brushless electric motors (commonly referred to as multirotors).
The rotor units enable drones to hover at a precise altitude and position and operate in confined airspace. The technology for both systems relies on the featherweight lithium polymer battery that stores an incredible amount of power and the brushless motors that have a large variable speed range with good power at all speeds, lightweight airframes and a simple, hobby-type airplane radio controller. GPS and altimeters enhance their capabilities.
Small, on-board video cameras with micro-video transmitters enable pilots on the ground wearing digital video headsets to “fly” as though they were sitting in the pilot’s seat.
The control accuracy of a multirotor drone design is extremely precise. Drones can fly at incredible speeds horizontally or vertically, reach 400 feet in a few seconds, hover and stop on a dime.