You can buy models that are small enough to fit in your palm that are great for inside and garden use to larger models with multiple propellers that can fly hundreds of metres into the air taking stunning video footage with their built-in camera. Some come equipped with high-definition cameras, while others allow you to fit a camera of your choice.
Most of the larger drones can be flown for up to 20 to 30 minutes before the battery needs recharging or replacing with a spare. You can basically fly radio controlled drones in non-populated areas where it doesn't endanger the general public or flying aircrafts. Many of the more expensive drones have have a built-in feature that prevents them from being flown close to airports for added safety.