This is an auction for a used throttle controller made by DTE Systems called a PedalBox for the BMW 135i E82 or 128i. This worked perfectly on my 2011 BMW 135i. It's easy to install and makes your gas pedal (throttle) more responsive. It worked great and allows your car to take off right away just by barely applying pressure on the gas pedal. This is the more expensive version which allows you to operate the controller via bluetooth on your smartphone. If you don't want to use your smartphone you can just use the control box that's attached to the controller. The way I had it set up in my car is that I hid the box underneath the center console then I would adjust the settings using my smartphone. Very stealthy.