This is the Electric Powered, Radio Controlled, Almost Ready to Fly Thunder Tiger Raptor E550S 3D Helicopter with Flybar. FEATURES: Airframe: Two-piece plastic with large battery compartment Rotor Head: 140° eCCPM for precise and responsive 3D performance Motor: Ace RC Ripper OBL44/11-30H 1150kV brushless Tail Rotor: belt driven Electronic Speed Control: Ace RC BLC-80A Gyro: TG7200 heading hold Servos: Three high-torque, metal-gear cyclic servos, one DS0606n digital tail servo Main Blades: 21.7" (550mm) carbon fiber Landing Gear: Constructed of nylon with low-profile aluminum skids Tail Boom: Aluminum INCLUDES: ARF Thunder Tiger Raptor E550S 3D Heli with Servos, Brushless Motor, Gyro, Servos, Main and Tail Blades, Body and Instruction Manual REQUIRES: Radio: At least 6-channel with heli programming Receiver Battery: NiMH 4.8V, at least 1100mAh Battery: 6S LiPo Battery Charger: For selected LiPo LiPo charging sack, building and field equipment SPECS: Main Rotor Diameter: 49" (1245mm) Tail Rotor Diameter: 9.3" (237mm) Main Rotor Length: 23.62" (550mm) Tail Rotor Length: 3.74" (95mm) Length: 45.25" (1150mm) Width: 5.5" (140mm) Width Between Landing Gear: 7.1" (180mm) Height: 15.35" (390mm) RTF Weight: 5.8lbs (2.65kg) Gear Ratio: 1:10.09:4.56 jxs 11/13/12 ir/jxs