Syma X20 and X21: Pocket-Sized Fun
Syma has put together two very similar drones in the X20 and X21. They are both pocket-sized drones that have altitude hold. You can opt for the small X21 or the tiny X20. The Syma X21 checks in at 5.3 inches by 5.3 inches (13.5 x 13.5 cm) when measuring to the tips of the …