Is this hub able to work at all without the power supply? If i only need to use 1 or 2 of the ports?

Definitely no! Without power it's totally dead - like a stone! You must connect it to power and then you can expect it to work - if there is no anything other wrong. If you don't want to use power, you can check another model - http://www.amazon.com/Anker%C2%AE-4-Port-Portable-Aluminum-2-Foot/dp/B00IJ331WY/ref=sr_1_2?ie=UTF8&qid=1416424283&sr=8-2&keywords=anker+usb+3.0+hub. It has only 4 ports and cannot charge devices, but it's more compact and doesn't power connection at all.

Does this unit also plug in directly to an electrical outlet (so it can act as a charging "hub")?

Yes. There's also one USB plug that is only for charging, no data.

can all seven ports be used for data transfer, or are some for charging only?

Have not tried to use all 7 ports. Paraphrased from mini welcome guide: "Use DC power adapter...and use the USB 3.0 type B cable to connect the hub to your computer. You may now connect any devices to the hub for data transfer or charging."

why are hubs so expensive past 4 port? I don't see anything about them that really justifies the price.

These devices are not just splitters, they have to have circuitry to route the signals. More ports = more circuitry = higher cost. USB 3.0 devices are still at a premium compared to USB 2.0. If you don't need the increased speed of USB 3.0, USB 2.0 hubs are cheaper. You could also use 2 smaller hubs if you have the ports available.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Anker Powered USB Hub for Laptop, 7 Ports USB 3.0 Data Hub, with 36W Power Adapter and BC 1.2 Charging Port for iPhone 7/6s Plus, iPad Air 2, Galaxy S Series, Note Series, Mac, PC, USB-Flash Drives

Anker Powered USB Hub for Laptop, 7 Ports USB 3.0 Data Hub, with 36W Power Adapter and BC 1.2 Charging Port for iPhone 7/6s Plus, iPad Air 2, Galaxy S Series, Note Series, Mac, PC, USB-Flash Drives

Product ID: 19042139

Details

Brand
Anker
Color
Black
Compatible Devices
Smartphones
Hardware Interface
USB 3.0
Special Feature
Play Plug

⚡7 USB 3.0 SuperSpeed ports @ 5Gbps

📏Compact 4.3×1.7×0.9in, 2.9oz design

🔋7 ports with 5.1A total charging power

Description

🚀 Power, speed, and style—7 ports to rule your digital world!

POWERHOUSE CHARGING HUB - Charge multiple devices simultaneously with a total 5.1A output, including a fast-charge BC 1.2 port.
PLUG AND PLAY SIMPLICITY - No drivers needed—just connect and go on Windows and Mac OS for effortless multitasking.
SUPER SPEED DATA TRANSFER - Experience blazing 5Gbps USB 3.0 speeds across all 7 ports—no more waiting on syncs.
ULTRA COMPACT PORTABLE - Palm-sized and featherlight, this hub fits seamlessly into your workspace or travel bag.
SMART LED PORT INDICATORS - Stay in control with blue backlit port numbers that light up when devices are active.

The Anker 7-in-1 USB 3.0 Hub delivers ultra-fast 5Gbps data transfer and robust 5.1A total charging power in a sleek, compact design. Compatible with Windows and Mac OS, it supports plug-and-play and hot-swapping, making it the perfect all-in-one solution for professionals needing to expand connectivity without sacrificing speed or portability.

Specifications

ASIN	B014ZQ07NE
Additional Features	Play, Plug
Best Sellers Rank	#232 in USB Hubs
Brand	Anker
Color	Black
Compatible Devices	Smartphones, USB Flash Drives, Tablets, Desktops
Customer Reviews	4.5 4.5 out of 5 stars (12,345)
Data Transfer Rate	5 Gigabits Per Second
Enclosure Material	Plastic
Hardware Interface	USB 3.0
Item Dimensions L x W x H	4.3"L x 1.7"W x 0.9"H
Item Weight	0.71 Pounds
Manufacturer	Anker
Mfr Part Number	AK-68ANHUB-BV7A-0004
Minimum Required Operating System Version	Mac OS X 10.2 Jaguar
Model Number	AK-68ANHUB-BV7A-0004
Number of Ports	7
Operating System	Mac
Total Usb Ports	7
UPC	848061071467 848061077643
Warranty Description	18-month warranty

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