Syma F4 2.4GHz 3-Channel Remote Control Helicopter (Color may vary: Black or Red) Assembled with all pre-flight adjustments, simply get it fully charged and insert the batteries, it&#39;s ready to take off. Double protection propeller to ensure steady flight, it will be power-off automatically when chocked. Able to fly both indoor and outdoor. Please charge the units from 40 to 50 minutes , to fly the units upto 5 mins 3 Channel, go up and down, forward and backward, turn right and left. Built-in gyro, high quality alloy fuselage, stable and flexible. Using spread spectrum technology for further remote distance, best anti-interference ability, least power consumption. you could fly more helicopters at the same time, its reaction speed is 100 times faster than other radio control