Fangrui Product Details 16-way Adjustable Countdown Timer:offers 16 Settings From 0-10 Minutes, Allowing Precise Turbo Timer Customization For Various Vehicles. Multi-functional Display:displays A/f Ratio, O2 Sensor Voltage, And Battery Voltage, Providing Comprehensive Vehicle Status. Universal Fit With Pen-style Design:pen-shaped Design Offers A Sleek, Compact Fit For Any Vehicle With A 12v Power Source. Handbrake Safety :prevents Vehicle Theft By Shutting Off When Handbrake Is Released Without Ignition Key. Installation Time: 45-60 Mins Installation: To Be Installed By Professional Only Operating Temperature: -20-60c(-4 To 140 F) Posite With Led List Digital Timer Functions: Manual Mode (0-10 Minutes) Memory Mode #1 (1 Touch, 1 Minute Setting) Memory Mode #2 (1 Touch, 3 Minute Setting) Battery Voltage Display:compatible With All Turbo Timer Harnesses Battery Voltage Peak Value Indication On/off Warning Function Note: All Items Are Brand New Unless Stated Otherwise On The Listing. We Sell Diy (do It Yourself) . We T