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PowerBoost 500 Basic - 5V USB Boost @ 500mA from 1.8V+ : ID 1903 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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USB 2.0 4 Port Powered Hub Plug and Play up to 100mA per port, or up to 500mA (with power adapter) over current protection on each port Windows 2k, XP, Vista, Win7,
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