Voltmeter specification :
*LED Voltage Gauge
*Accurately and clearly displays car audio voltage levels
*Brilliant LED screen: blue
*With logo led TRF
*Display LO below 9.5V
*9.7-12 Blink
*12-16V always bright
*Above 16V flicker

CONNECTION:
*RED : +12V BATT
*BLACK: -12V GND
*BLUE : ACC