How long a cable can be attached between the USB port and the hub?

Cable length for USB 3 recommended is 9.8 feet ( 3 meters), but having a powered hub can extend that range. 9 .8 feet from computer to hub, and 9.8 feet from hub to device. If you use a none powered hub it will not extend the range

I planning to use this to connect 2 units of USB3.0 3T external hard drives to my laptop. Does the hub need to be plugged in to AC power when in use?

Yes you can, the power cable is for charging devices but, i used tthe adaptor for a month and it stopped workin, i send it back and they said that they will ship me a new one, i already recived the confirmation

A: can this be used without external power supply as a functional 3.0 HUB? B: can they be daisy chained and if so how many?

I just did a little experiment. With my phone and unpowered external HDD attached to the hub I unplugged it and the devices stayed connected. So, it at least works as an unpowered USB hub. However, I didn't run any speed tests or anything to confirm it was working at 3.0 speeds. I only have 1 so can't answer your Q about daisy chaining from first hand experience. But I recall when I was researching, reading someone else's comment that it was possible. YMMV.

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SYBA Connectland CL-HUB20126 USB 3.0 4-port Pocket Size Hub, 5Gbps Data Rate, Free AC Adapter and Cable - Black

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Plug & Play Easy Installation
Quick Recognition
Automatic Handling of USB Protocol
Powered by 3.5A External Power Unit
Compatible with USB V3.0, USB V2.0, and USB V1.1

Overview

Specs

Reviews (25)

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This 4 port USB 3.0 Hub can provide power to connected USB devices by means of the included power supply. This is not necessary when the devices connected to the hub don't need to be powered from the USB port.

USB 3.0 Four-Port Pocket-Size Hub with Power Adapter
CL-HUB20126

Compactly designed, this Super Speed USB 3.0 Hub is designed for today's high performance peripherals. Each port is capable of cranking out 900mA of current, which can easily charge any power hungry tablet PC and Smartphones.

The Connectland Four-Port USB 3.0 Hub allows you to connect up to four USB peripherals to your PC, and it will work seamlessly with USB 3.0, USB 2.0, and USB 1.1 devices.

Highlights

Four-Port USB Hub
Allows you to connect four USB peripherals - such as digital cameras, printers, external hard drives, mice, keyboards, flash drives, and tablets - to your laptop or desktop.

Power Adapter Included
Includes an AC adapter to support the most power-hungry USB devices.

Easy to Use
Plug-n-play, so you can plug it into any computer without having to worry with configurations.

Specifications

Designed for Desktop Computers and Notebook PCs
Supported Current in Full Charge: 900mA Maximum Per Port
Plug & Play Easy Installation
Quick Recognition
Automatic Handling of USB Protocol
Powered by 3.5A External Power Unit
Compatible with USB V3.0, USB V2.0, and USB V1.1
Color: Black

Package Detail

USB 3.0 4-port Hub
User Manual
USB 3.0 Cable (24")
AC Power Adapter (45" Cord, 5V)

Dimensions (L x W x H): 7.5 x 5 x 3 inches
Weight: 0.69lbs

Software Requirements

Windows 8
Windows 7 32/64-bit
Vista 32/64 bits
Windows XP 32/64-bit
Mac

Hardware Requirements

Computer with USB 3.0 Port

Model
Brand	SYBA
Model	CL-HUB20126

Details
Color	Black
Type	USB
Standards	USB 3.0
Ports	4 x USB 3.0 Type-A Female Ports 1 x USB 3.0 Micro B Female Port 1 x AC adapter Power Input Jack
Transfer Rate	5 Gbps
Operating System Supported	Windows 7 32/64 bits Vista 32/64 bits Windows XP 32/64 bits
Weight	0.6

Features
Features	Designed for Desktop Computer and Notebook PC Supported Current in Full Charge: 900mA Maximum Per Port Plug & Play Easy Installation Quick Recognition Automatic Handling of USB Protocol Powered by 3.5A External Power Unit Compatible with USB V3.0, USB V2.0, and USB V1.1 Color: Black

Packaging
Package Contents	USB 3.0 4-port Hub User Manual USB 3.0 Cable (24") AC Power Adapter (45" Cord, 5V)

Additional Information
First Listed on Newegg	August 27, 2012

Warranty & Returns

Warranty, Returns, And Additional Information

Return Policies

Return for refund within: 30 days

Return for replacement within: 30 days

This item is covered by Newegg.com's 30-Day Return Policy. Read full return policy for details.

SYBA Connectland CL-HUB20126 USB 3.0 4-port Pocket Size Hub, 5Gbps Data Rate, Free AC Adapter and Cable - Black