1).Gyro stabilized 2).Indoor and outdoor 3).All factory assembled. Easy and ready-to-fly 4).Unique electronic control system 5).remote control distance:UP 100m 6).flying hihe:100M 7).flying time:4-5minutes 8.charger time:20-25minutes 9.battery:8 UFO: 1 x 12V NI-MH rechargeable battery pack (included) Transmitter: 8x "AA" size alkaline batteries required (not included) For ages 14 and up