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This is the USB Power Cable and Wall charger specifically designed to meet the specific power requirements of the HDFury and HDFury 2. The specs say that the HDfury draws it's power directly from the DVI/HDMI line but that an optional +5VDC input is provided for HDMI cables that are over 5 meters (16 feet) or if the source device is unable to supply adequate power.
The DC jack on the side of the HDfury units is unique and must follow all these requirements: - Provide REGULATED (+/- 5%) 5VDC power with 0.5A min DC current
Deliver the power through a small 0.65mm diameter center pin / 2.6mm outer diameter DC plug (like the one often used in cellular phone AC adaptor) - Provide the correct polarity with 'plus' on the OUTER part of the plug and 'minus' (ground) on the small center pin of the DC jack. Trying to use an AC/DC adaptor that doesn't follow all these three requirements may destroy the HDFury. This external HDFury powering option is only needed in one or both the following situations: The DVI or HDMI cable is using thin gauge copper wires and its length exceeds 5 meters (16 feet).
The DVI or HDMI source is unable to deliver the 0.5A maximum current over its HDMI or DVI pin #14. This situation often occurs when HDFury is used with cheap DVD/HD players at 1080p60 mode.