Feature: 1. Professional and practical automotive air fuel ratio measuring tool with high sensitivity and easy operation. 2. Easy to install, no complicated tools required, universal install on any 12 volt vehicle. 3. Clear and bright LED display with 7 colors, white, red, green, blue, yellow, cyan, purple. 4. Made of high quality ABS shell and aluminum material, anti-corrosion and high strength for maximum durability. 5. High level of accuracy and sensitivity, enhance safety of your vehicle. Specification: Condition: 100% Brand New Item Type: Air Fuel Ratio Gauge Material: ABS + Aluminum Applicable Models: 12V vehicles Driving Voltage: DC 5V Drive Mode: 1/64 MICROSTEP Drive Current: 30MA Maximum Working Temperature: -40 ℃ -105 ℃ Storage Angle: 340 ° Origin Position Accuracy: CCW: -1.5 ° -0.5 ° Noise: 22bda Maximum Life Time: 2000hr/min Backlit Colorful LED Lights: White, red, green, blue, yellow, cyan, purple Button Backlight Color Switching: Manual Digital Tube: 3-bit Blue light Pointer Drive: High-speed stepper motor Pointer: Red Dial Surface: White text on black background Scale: White Shell: Black Shell Ring: Black Installation Opening Size: Approx. 52mm / 2in Diameter. Package List: 1 x Air Fuel Ratio Gauge1 x Wiring Harness1 x Manual