I created a Power Functions RC tracked racer featuring my own version of a subtractor mechanism, which allows it to be controlled just like any conventional RC car, one lever to go
Amazon.com: LEGO 42065 "RC Tracked Racer" Building Toy : Toys & Games
The quest for the ultimate 42065 RC Tracked Racer - RacingBrick
RC Tracked Racer 42065 | Technic™ | Buy online at the Official LEGO® Shop US