revolutional design High quality and inexpensive Metal structure EN71,ASTM Sanhuan UFO 2.4G 4CH RC Quadricopter 3D Rolling Function:After you are familiar with the basic play of 4 channel helicopter, you can try the advanced mode.Fistly,turning the controller's helm to maximum until the LCD screen turns orange,fly it up to more than 3M high,turning the forward&backward or left&right fly function ...