Sanwa MX-3S Radio set Synthesized 40mhz Newest version! with Synthesized module and receiver Sanwa has for many years engineered top performance radio systems that just can't be beat. The MX-3S comes with 18 model memory and many features that will get you over any finish line first. The MX-3S is SYNTHESIZED as well to let you select your channel fast and easy so you can get racing fast and not have to wait for a open channel.