PCX-30F - Power Acoustik 30-Farad Hybrid Digital Capacitor PCX30F PCX 30 F. 24 volts DC Internally Stacked Capacitors (foil-carbon). Internally Stacked Capacitors (foil-carbon). Digital Blue Voltage Display. Tinted Plexiglas Viewing Window. 8 Blue LED s Lighting inside Viewing Window. Electronics Polarity Protection Circuit. Over Voltage Protection Circuit. Platinum Plated Heavy Duty Ring Terminals. Satin Finish with Chrome End Caps and Mounting Brackets. Aluminum Case Gift box With Front Glass Display.