A drone can be as big as an airplane or as small as the palm of your hand. So what kind of drone can be classified as "mini drone"? The key is the body weight(batteries included), not the size. A lightweight weight of less than 250 grams (0.55 pounds) is the only threshold to enter the mini drone category. Because in many regions, it has been explicitly stated that drones weighing more than 250g need to be registered before they can legally fly. For novices, a drone under 250g is a wise option, not only flying with fewer restrictions and requirements, but also equipped with the eligible performance of shooting and flight, and a relatively more affordable price.