APEXi Auto Timer For Turbo and Non Turbo Cars Separate control and base units allow installation in vehicles with limited space. The first timer to automatically calculate idling time by using your car's O2 sensor signal. Calculates Air/Fuel Ratio (Not compatible with some vehicles) and displays LEAN/RICH LED. Displays battery voltage and brown out warning. Includes English fitting instructions Dimensions: 25mm X 63mm X 49mm Not compatible with all Engine Immobilisers. Please check with Immobiliser manufacturer/installer about compatibility. Plug in kit available to suit some cars.