BOSS Audio CPBL2 &ndash; 2 Farad Car Capacitor For Energy Storage To Enhance Bass Demand From Audio System 3 Digit Bright Red Digital LED Voltage Display Audible Warning Tone for Reverse Polarity, Voltage Overload and Low Battery Voltage Capacitance: 2,000,000, Capacitance Tolerance: + / - 10%, Voltage Measurement Accurate to + / - 0.1 VDC Working Voltage: 16 VDC, Equivalent Series Resistance: &lt;0.00195 mW @ 120 Hz / 25C Dimensions: 3 x 3 x 10.3, Unit Weight: 3.8 Lbs 1 Year Warranty