Skyartec NINJA 400 3D Pro CCPM 6 Channel RC Helicopter RTF (Ready to Fly) Can fly in skyway, backward, and 3D aerobatic 120 degree PPM system provides precise movement if comparing with the traditional mechanical mixing since there are less linkage/push-rod in the helicopter and weight is greatly reduced Improved blades give superior lift. Their pop off design gives extra protection in case of heavy landing Improved battery support that holds the battery firmly, and can also be adjusted to suit your balance of flying Newly Designed Rotor Head gives better control and easy to install Extreme smooth control and stable flight