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This hub was purchased to power my Raspberry Pi micro-computer and peripherals. When I powered up the Pi using the hub and a USB-MicroUSB lead, the image on screen was constantly breaking up and I couldn't connect to any external device on USB. Since then I tried a Kindle OEM power supply and the Pi on-screen image was 100% stable. Conclusion - Hub power not stable. I then connected the peripherals direct to the Pi, and they are accessible. Conclusion - Hub not working at all.