The Esky 2.4 Ghz Big Lama Outdoor 4ch RC Helicopter is designed for outdoor flight. The much larger size(see image below for a comparison) of the big lama gives it more power and stability in the wind. The 4 channel helicopter is designed for more experienced users but they are still easy to fly for beginners. It is moderately more difficult than a 2 or 3 channel but provides more accurate control. The helicopter charges via an AC/DC charger(included).