The Apexi Auto Timer allows the vehicle to idle for a preset amount of time after the ignition key has been removed. This prevents hot oil in the engine from 'coking' (solidifying) in the lines or centre section of the turbo. Proper cool down is essential for a healthy engine.The auto timer stands as a technological marvel. The pen shaped, compact size makes the auto timer one of the smallest turbo timers on the market, This allows a clean and sylish installation virtually anywhere inside the car. The unique multi angle joystick allows easy navigation through the many feature menus.Upgraded in every way from the previous model, the new auto timer can automatically determine the necessary amount of idle time. A manual mode allows the user to preset desired idling times from 0 sec ~ 10mins in 16 increments, By inputting oxygen sensor voltage, the timer can also display theoretical air fuel ratio. The timer can also display critical data such as oxygen sensor voltage and battery voltage.