36V blue digital volt meterThis voltage meter will give you a real time voltage reading from your batteriesYou will never have to risk being stranded from your batteries going dead. Display Color: Blue Dimensions: 1.6 x 1 x 0.79 Refresh Rate: 0.5 Second Design: Waterproof, Dust-Proof, Shock-Proof The meter is extremely easy to wireJust connect + to + and – to -If you want to connect it through a key switch then connect + to switch, switch to battery +, and – to -Please let me know if you have any other questions I can assist you withThanks again.