Problems with power supply of USB devices

Problems with power supply of USB devices

Logitech Premium 4-Port USB Hub for Laptop (Personal Computers)
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Customer Review

For most USB devices hub works fine. The problem arises, however at USB devices that rely on a power supply via the USB port. My bank card reader (Cyber ​​Jack) is supplied only after five to ten times Neuanstecken permanently with electricity about, and then the green light will illuminate the stroke. Until then, the card reader will start only for fractions of a second and turns right back on. it's frustrating...

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