Crash-avoidance sensors: Many present day drones have sensors that detect obstacles approaching in almost any way and will keep away from them. Battery lifetime and variety. They're good factors to look for with any drone. Don't forget that the battery existence is probably gonna be shorter than you’d hope – https://dise-o-web68774.thelateblog.com/28654346/the-greatest-guide-to-payload-of-drones