... 3. 2.4Ghz radio, Built in Gyroscope, Servos and Electronic Spe rc helicopter:1. Durable and Precise;2. Anybody can fly well;3 ... . 2.4Ghz radio, Built in Gyroscope, Servos and Electronic Speed Controller ... . Suitable for interior Flying at Gym, household and Office;7. 3D Effect with High Flying Performance.