2 in 1 helicopter has a built in sensors that keep the helicopter stable while flying. REMOTE MANUAL : The product helicopter comes with an easy to use and functional remote. The left button should be pressed to stop/start the helicopter. The right button can be used to keep the helicopter flying the the air. FLASHING LED LIGHTS : It makes you flight even smoother and funny during Night or Darkness. NOTE : This is INDOOR Helicopter and not to be used OUTDOOR. FLYING HEIGHT IS LIMITED TO 8 FEETS.