6-axis gyro for stable flight and easy operation 2.4GHz remote transmitter with up/down throttle stick forward / backward trimming forward / backward / left / right control lever left turn / right turn trimming sideward fly trimming speed control and power light Start-up over-current and low-voltage protection LED light indicates charging status 2.4GHz frequency allows for multiple copters to fly without interference Includes Skyflyer 3.7V rechargeable lithium battery 2.4GHz remote control transmitter USB charging cable and pack of 4 replacement rotor blades Controller requires 4 AA batteries (not included) Measures approx. 8 diameter weighs 10 oz For indoor / outdoor use Recommended for ages 14 and up