"REVOLT Mini Heli measures just 10.4 x 6 x 2.54 cm (4.1” x 2.36” x 1”) but it’s packed with features typically found in larger remote-control helicopters. This 3.5 channel (2.4 GHz) mini helicopter offers exceptional agility and ease of flight with one-button take-off/landing and auto-hover. The REVOLT Mini Heli is extra tough and built to withstand crashes, making it great for first-time pilots to sharpen their flying skills. Intended for indoor use (or outdoors with little or no wind) Includes rechargeable Li-ion battery (3.7V/200 mAh), USB charging cable and replacement tail propeller. Remote control requires 4 ""AAA"" batteries (not included)"