Quadcopters became popular in the early 2010s and since then companies have created newer and cheaper drones. Nowadays quadcopters (or drones) are most used for film making and racing and equipped with better cameras and better batteries than in the past.
The audio was recorded on a quite windy day, so the drone had some difficulties on staying steady in air. Besides the buzzing drone, you can also hear birds singing in the background.
Sound recorder, video recorder, photographer: Mikael Maffei.