Detailed product description Next generation mini helicopter-improved performance. Rotary wing span 2ft, length is 1.5ft. Twin powerful motors.4 channel R/c set included, complete left and right, up and down with pitch control. FM transmitter included, mode 1 (right handle throttleor) or mode 2 (left handle throttle), frequency with 35mhz,40mhz and 72mhz.10-20 minutes fly time. Brand new in original package. Powered by re-chargable battery (nimh 8.4v)(adaptor included). Complete kit, ready to fly. Only needs 8aa batteries for transmitter, also included spare parts please check listing included Package includes: 1>xst mini helicopter (pre-bulit, zero assembly time) 2>original speed mixer+gyro board 3>4 channel receiver 4>dragonfly transmitter 4ch with servo reverser 5>2 x 9g servos 6>1 pair of crystals 7>nimh rechargeble battery 8>110v charger (220v available) 9>simulator cable 10>english manual Specification Helicopter 1. Diameter of main rotary wing:510mm 2. Length of the airframe:470mm 3. Maximum flying weight:350g 4. Main motor: Type-280 5. Tail motor: Type-015 Transmitter 1. Number of channels:4(4ch) 2. Hf modulation mode: Frequency modulation (fm) 3. Encoding mode: Pulse code modulation (pcm) 4. Working voltage:9.6-12v (8 type-5 rechargeable batteries, or common alkaline batteries) 5. Working currency: About 180 ma 6. Antenna length:960 mm 7. Working frequency:35mhz,40mhz,72mhz 8. Additional function: Interface for computer simulator 9. Mode 2 left hand throttle receiving part Receiver: 1>receiving part distribution: Multifunctional integrated receiving board (receiving, decoding, mixing, and gyroscope) + 2 mini-servo (12g) 2>external dimension of integrated receiving board:40 x 30 x 8.5 mm 3>weight:12.6g 4>modulation mode: FM 5>intermediate frequency:455k 6>antenna length:800mm 7>working voltage:8.4v (7 style-7 nickel hydrogen batteries) 8>working currency: Static 20 ma