DESC: Imagine the fun of flying and hovering a small mini rc helicopter in your office, living room or backyard. And with many micro rc helicopters to choose from, the indoor flight hobby is a buyer's delight.With rotor diameters of 21" and weight of around 300 grams, these helicopters are small enough to hold in your hand. Powered by NiMh rechargeable battery packs, these mini rc helicopters can have flight times of 7 to 20 minutes per charge.