The INUM is as easy as R/C gets. It's fully loaded with everything you need for exceptional indoor flights. This model delivers slow, smooth flights with good control authority. In a small gym anyone can fly the INUM and feel like a pro. It's simple for novices to fly and still entertaining for advanced flyers. In one box you get a pre-assembled INUM Indoor Flyer RTF, rechargeable 3.7V 35mAh LiPo battery, interference-free 2.4GHz transmitter with built-in LiPo charger, and four "AA" batteries. All you need to do to fly the INUM is plug in the battery.