what is the USB cable Length ?

About 4' to 6' feet. but with the power plugged in you can have long cables going into the hub.

Questions & Answers: StarTech.com ST4300USB3 4 Port USB 3.0 Hub - 4 x SuperSpeed USB 3.0 - Black - Compact - USB 3 Hub - USB Splitter - Powered USB 3.0 Hub - USB Extender

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StarTech.com ST4300USB3 4 Port USB 3.0 Hub - 4 x SuperSpeed USB 3.0 - Black - Compact - USB 3 Hub - USB Splitter - Powered USB 3.0 Hub - USB Extender

Add four external SuperSpeed USB 3.0 ports to your laptop Ultrabook or desktop from a single USB 3.0 connection
Works with virtually any USB 3.0 equipped computer
Ideal for Ultrabook & MacBook users with limited USB ports
Compact form factor / Includes optional power adapter
Add high speed USB 3.0 ports to your PC / Connect peripherals and external hard drives or flash drives in the home or office
4 Port USB 3.0 Hub / Notebook & Laptop USB 3.0 Hub
Desktop USB3 Hub / External USB Hub

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