1. Digital Display: Display speed, water temperature, instantaneous fuel consumption, hour fuel consumption2. Performance Testing: Vehicle acceleration test3. OBD2 Engine Diagnostic Functions: Data flow function display, display color configuration, fault code scanning, fault code clearance and other functions4. Early warning function: Water temperature warning, over speed warning, shift warning.Specifications:Operating voltage: 9-18V DCOperating current: less than 80mASleep current: less than 10mAOperating temperature: -20~85Product volume: 75mm x 55mm x 20mmSpeed meter indication error Speed Meter indicates speed and actual speed according to formula :O less than or to Vn- less than or to (V: + 10) + 4V1- speed meter indicates speed in km/hV2- an actual speed in kilometers per hour (km/h).The vehicle speed correction is based on 100km/h.The error of the vehicle in the low speed state is the reason why the original vehicle meter is not linearly displayed.Specifically, you can connect to the OBD socket test with a dedicated instrument in the 4s shop.colour: blackMaterial: ABSPackage Contents:1 x 1 x OBD cable1 x and English manualOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.