Features:1. O2 sensor voltage A/F value can be displayed.2. Displays A/F ratio as RICH or LEAN via 2 colors LED.3. Automatic countdown feature in order to ensure the top countdown setting from the widest array of vehicles the user can choose from 144 different settings.4. First Timer to utilize O2 sensor voltage when calculating count down time compared to timers that only use vehicle speed and RPM, this Timer can set the most accurate after idling time possible.5. This Turbo Device is equipped with a parking Brake safety function which will keep the car from moving forward when idling in the count down function.6. Installation instruction is include,please read carefully when you install.Specification:Condition: 100% Brand NewItem Type: Auto Turbo TimerMaterial: PlasticColor: BlackFitment:Universal Fit for All Vehicles with a 12 Volt Switched Power SourcePackage List:1 x Control Unit1 x Relay Unit3 x Zip Tie2 x Double Sided Tape .