Ultra Standard Series Volt Meter gauges give you a classic analong gauge view of your battery voltage. Realize issues with your alternator/battery charging by having constant knowlege of your battery voltage.You'll benefit from standard features including: User adjustable low voltage warning, easy to see warning lamp, separate peak session indicator, startup needle sequence similiar to STi models, shutdown sequence that shows session peak, ability to run additional external warning lamp, separate day/night backlighting contrast. Other avanced features include 50 seconds of record and playback ability. Useful if your doing autocross or other racing where you want to pay more attention to the road and then review your voltage response later. Audible alerts can be turned on/off, peak recall on demand, all controlled from a small wireless remote. No bulky control boxes to install and clutter your dash or console. Optional Radiator Fan Control Module interfaces with the gauge to run radiator fan when the gauge temperature warning is reached and continues to run until the temperature falls below the warning point. Note, wireless remote sold seprately. Included at no charge with purchase of 3 or more gauge.