This is a 0.36" LED display mini 30V DC digital volt meter panel in Red Color. This voltmeter can read voltages ranging from 5 volts to 30 volts. It is simple to use and a great replacement for old, difficult-to-read analog panel meters in projects. Only two wires are needed to interface this device with the target circuit and the DC voltage used for powering the meter is from the target circuit. This assures simple, trouble-free installation.