Walkera HM#38 - The biggest RC tandem Chinook helicopter in the market - 4 Channels + 2.4 GHz + CNC Metal upgrades (GREEN CAMOUFLAGE) Highly emulational shape with the-state-of-the-art workmanship New 2.4G technology, with the functions of automatic identification and precise code pairing, can allow above 20 aircrafts to fly in the same field and same time. It utilizes the 2.4G 3-in-1 receiving circuit with the functions of servo extent adjustment and built in gyro sensitivity adjustment High performance 4 * 370SH motor powered by 7.4V 2200mAh Lipo offers 10 minute flight time, depending on the flight modes. WK-7.6-3 weight 8.5g / Speed 0.11sec/60o(4.8V) / torque 0.9kg/cm 4.8V) / dimension 22.5*11.5*24mm