Stone 2.4G Remote Control Helicopter Built-in Gyro.The first RC helicopter can fly outdoors in calm weather (outdoor wind grade 3-4).Entrepreneurship single propeller design, it can greatly avoid wind resistance,High quality ultrathin metal canopy ultra-light weight and strong resistance of impact.High strength rotor. Flight performance Shakespeare Rio T-REX 100S: extremely steady and very agile.Remote control design with an LCD display, the operation easier and more precise.Liberal fly up, down, forward, backward, left to fly, right, fly, hover with rapid response,It is suitable for indoor and outdoor flying (the wind grade should be no more than 4),22 cm mini helicopters.