Fangrui Product Details Universal For: Motorbike Car / Boat / Atv / Utv / Camper / Caravans / Travel Trailer Etc.twist-and-lock System. It Works For 6-30v. Mini Size And Easy To Install, Work Great For Checking Voltage. The State Of Your Battery Between Full Charged And Discharged. The Meter Has Easy To Read Led Segments And Connect To Your 5-25 Volt System. Used To Monitor The Storage-battery Voltage, With Reverse Connection Protection Function, Line Will Not Be Burnt. Timely Grasp The State Of Battery Voltage, Voltage Measurement Purposes Can Also Be Used For Other Products. Specifications: Waterproof Measure Voltage: 6-30v Dc Display: 3-digits 36inch Size: 37 X 29mm Mounting Hole: 29mm Interface Type: Anode And Cathode Eco-friendly Meterial: Acrylic Application: Universal For All Cars, Motorcycles And Other Universal Models. Package Includes: 1x Led Dc Voltmeter Note: Light Shooting And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error