Rockville RXC20D 20 Farad Hybrid Ion Car Capacitor Voltage & Amperage Meter 20 Farad Hybrid Capacitor. (1) 0 Gauge and (3) 4 Gauge Input / Output Terminals with Stealth Removable Cover. Operating Voltage: 10  16V. Surge Voltage: 24V. Blue LEDs - *18.8 Voltage and Amperage Display. *Due to limitations of Digital Display, the maximum display readout is 18.8V, though the capacitor functions up to 24V. Accurate live-time Voltage & Amperage monitoring. Custom Rockville Amplifier style housing with heavy duty platinum plated, bolt down terminals. IC-Controlled voltage protection circuitry. Polished Chrome trim with an Ultra smooth Gloss Black Finish. Stealth Removable protective terminal cover. Unit dimensions (Inches): 11.93 L x 6.54 W x 2.84 H.