These drones are completed automated, this means there is no human control behind these drones. They have the order placed and secured by another automated system and scans a code on the shipping label. The drone then locates the destination and goes and drops it off, it does not move once it lands at the destination, once someone presses the delivered button the drone takes off and goes back to its charging station.
Amazon Prime drone picking up a delivery
Although there are many problems with this new emerging tech, such as the local bylaws preventing drones from flying, airport no drone zones, and even not yet mapped or poorly mapped regions.
More cities are adopting bylaws that don't allow drones to fly.
You cannot fly a drone anywhere in Washington due to the security risks involving the president
Toronto has certain neighborhoods that have adopted no fly zones
Google and Amazon have both been working with different governments to try and get out of the ban, meaning they want to separate hobby flying and commercial flying into two different laws. This would allow them to use their drones are different heights from planes and hobby drones and would ban hobbyists from flying around the heights needed for commercial drones.
That's not to say that delivery drones can never happen, because there most likely will be a time when Amazon and Google's hard work will come through, and when that happens there will be so many opportunities to help the world. It will allow us to receive items that we need within hours of ordering, it will help improve the lives of those that cannot make it to different stores to buy items. The drones will also be available to everyone once google manages to map out everywhere.