Stinger SVMB Voltage Gauge - Blue Display (Discontinued by Manufacturer) LED Voltage Gauge Accurately and clearly displays car audio voltage levels Automatic operation, turn on and shuts down with car Simple installation requires the connection of 3 clearly identified wires Can be mounted or set flush in the panel for a personalized look Brilliant blue LED screen Cross-flow Fan Keeps amplifier components running cool Easy installation Draw: .19 Amp