Round Voltage & Amp Meter - 6V-30V & 0 Amp - 10 Amp MeterRound Digital Volt/Amp Meter is the same compact round size as a standard 12V receptacle and supports many installation options. Injection molded nylon construction. Red LED display. Input 4-30VDC. DC shunt not required. IP65 rating.WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.