It automatically detects and alerts you when your voltage level becomes either too high or too low, allowing you to worry less about constantly monitoring your gauges and focus more on driving.
 
It is microprocessor-controlled and reads 7 to 25.5 volts with spot-on accuracy!  Designed to work with any vehicle! 
 
It is accuracy, elegance, and intelligence all in one breathtaking display! 
Other features include:

2 5/8th inch diameter, only 1 1/2 inch deep;

Reads in .1 volt increments from 7.0 to 25.5 volts;

Gauge flashes when voltage is under the voltage levels for low and high you program;
Can be open or closed circuit.

Automatic night-dimming and programmable alarm system
 
Output wire can be hooked to any convenient button for you up to 3 amps!

Includes all necessary in-dash mounting hardware and switch wire!

Lifetime warranty!

Made in the USA!