GPC3030D led display

General Information Four Digital Panel Meters (GPC-3030DQ) Triple Output Auto Tracking Auto Series and Parallel Operation Constant Voltage and Constant Current Operation Low Ripple and Noise Internal Select for Continuous or Dynamic Load Overload and Reverse Polarity Protection Rotation Speed of the Fan is Controlled by Heatsink Temperature (Only European Specification)(GPC-3030DQ) 3 1/2 Digits 0.39" LED Display(GPC-3030DQ) 3 1/2 Digits 0.5" LED Display(GPC-1850D/3020D/3030D)