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Green-Cap super power capacitor is rated 500 Farads @ 2.7VDC. It is about 2.42" tall x 1.4" and has 2 "Snap In" terminals as shown. This capacitor can store close to 1800 jouels. Tremendously useful for powering items without a battery, experimenting with super capacitors. See also our G17930 Boostcap which is even more powerful!