Please note that if these drones are flown out of range so that the communication with the drone is lost, the drone can be easily lost as well. A common error is to fly the drone to its height limit and lose communication. If there is any wind, the drone may then do what is called a “fly away.” This is a sad thing for an operator because the drone will fly off to who-knows-where and unless you quickly go chase it; it can disappear forever.
There are a number of products on the market that are sold as drones, but don't quite fit the bill. Remote-controlled aircraft have been around for ages. (Check out this clip from Magnum, P.I. if you don't believe me, or just want to see Tom Selleck in a bathrobe.) But with the recent surge in popularity, quadcopters that would simply be sold as RC products are now being tagged as drones. These don't include GPS stabilization, return-to-home functionality, and other automated flight modes that make a drone a drone.