Rc helicopter application outdoor type of model rtf ready to fly propulsion electric rc functions down up left right special features gyro remote control included transmission mode radio number of channels 3 frequency range 2400 mhz transmission coverage 30 m maximum operating time 6 minutes charging time 120 min type of battery lipo battery voltage 37 v battery capacity 300 mah length 325 mm width 60 mm height 125 mm colours red wh