Nikko Rock CrushR Radio Controlled is engineered for terrain domination with patented Auto-Expanding wheels for exceptional grip. Reticulating arms automatically extend, ensuring unparalleled performance. Dual motor 4-wheel drive provides power and traction, conquering diverse terrains. The vehicle features a powerful built-in 9.6v LiFePo4 USB rechargeable battery for quick charging and extended playtime out of the box. The Nikko remote control operates on 2.4GHz transmission technology, supporting interference-free fun for up to 10 players racing simultaneously. Nikko upholds its reputation for quality, innovation, and efficiency through the latest technologies and extensive durability testing. The product is fully assembled and suitable for ages 6 and above, with specifications including a 13″ size, patented Auto Expanding Wheels, and a 2.4GHz transmitter.