Dual Pro Battery Fuel Gauge - DeltaView Link Compatible - 12V System 1-12V Battery 2-6V Batteries One Size. Our BFGs are DeltaView Link (DVL) compatible which lets you to monitor the state of charge of your batteries right from your iOS or Android mobile device. Since our BFG uses intuitive technology it fits and adapts to a wide range of applications. We take great pride in the performance quality and versatility of our products backed by exceptional customer service. 2. 25 Diameter x 2. 5LRequires 2 cutoutCable Length:13. 0 Specifications for Dual Pro Battery Fuel Gauge - DeltaView Link Compatible: Manufacturer: Dual Pro Color: Black Package Contents: Dual Pro Battery Fuel Gauge - DeltaView Link Compatible Dual Pro BFGWOV12V: Battery Fuel Gauge - DeltaView Link Compatible - 12V System 1-12V Battery 2-6V Batteries One Size