What Is In The Package:One 36V blue digital volt meter. This voltage meter will give you a real time voltage reading from your batteries. You will never have to risk being stranded from your batteries going dead. Display Color: BlueDimensions: 1.95″ x 1.2″ x 0.95″Refresh Rate: 0.5 SecondDesign: Waterproof, Dust-proof, Shock-proofVoltage Range: Up to 45VModel #: DV36VB Installation:This is an extremely easy process with its 2 wire setup. We can provide general installation instructions to guide you through the process.