Automotive Authority LLC 12V 12 Volt Digital Marine Trolling Motor Battery Indicator Charge Status Power Meter - GREEN 12/24V green 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: Green Dimensions: 1.95" x 1.2" x 0.95" Refresh Rate: 0.5 Second Design: Waterproof, Dust-Proof, Shock-Proof