The DX4C DSMR™ 4-Channel AVC™ surface radio system puts the power of a Spektrum™ 2.4GHz computer radio and the stability of AVC™ (Active Vehicle Control™) technology well within reach of the most budget conscious driver. When AVC technology is in use, the first two channels of the DX4C operate steering and throttle. The second two let you independently adjust the amount of steering and throttle assistance AVC technology provides. This makes it easy to dial in the perfect amount of stability for different types of surface conditions and terrain.