These lower noise but also decrease battery life 2 x Propellars (one of each type) The drones have 4 propellars, 2 with a white ring or dot, 2 without. They are different. This set has 1 of each. Each propeller blade has been carefully tested for dynamic balancing to ensure higher aerodynamic efficiency, lower power consumption, and further improve endurance. The new safety design effectively reduces possible damage caused by unexpected situations.
