Simple Installation: For vehicles with electronic control (ETC) systems, or drive by wire, this device plugs into the OE connector located behind the accelerator pedal. It is a simple installation, requiring no cutting of any wires. Three Position Settings: Off (no light): Device is not active and vehicle is stock. Sport (Green): Device is active, throttle response and acceleration are improved over the mild setting. Race (Red): Device is active, throttle response and acceleration are improved over the mild setting. Better Drivability: In addition to the increased throttle response and the improved acceleration, there is also a noticeable difference in the transmission shifts (for vehicles equipped with Automatic transmissions). This product fits the following vehicles: 2007-2015 Chevrolet Silverado/Avalanche/Tahoe/Suburban w/ A/T, 2007-2015 GMC Sierra/Yukon/Yukon XL w/ A/T, 2007-2015 Cadillac Escalade (Incl ESV, EXT) w/ A/T