Hitec Lynx 4S AFHSS 4096 HHR 2.4GHz Radio including Axion 4 RxDescription Rev your engines, the sleek, new Lynx 4S has arrived! Designed from the ground up for the avid racer yet versatile and economic enough for the everyday driver, the Lynx 4S arms all R C enthusiasts with the power, control and speed required to dominate the podium. The convenient micro SD card slot allows storage expansion of the radio's already vast 30 model memory to an additional 30 models while also archiving music and warning sound