Does anyone use the 5v port in the back?

Most non-self-powered USB devices can power themselves from the lower amperage provided by the PC over USB. The more ports on the hub (with active devices), the more power is needed from the source (the PC or the wall plug). Devices will begin to struggle if there's lots of devices plugged in, or any high-power drawing devices, if the hub isn't powered by a good power supply. I think most PC USB ports put out 0.5 amps, or 1amp for the charging ports on newer machines. That gets distributed 4-ways with this 4-port hub, so if you have 4 devices pulling the power evenly, they would receive 0.125 (or 0.25) amps each. I think about 0.5 amps is what certain higher-end devices would require, like 1080p webcams and stuff. Typically mice and keyboards would be far less.Not all hubs give you the option to plug in a dedicated 5V plug. Many of the "powered" hubs, will also work without the plug, too, for smaller devices. This is nice because they sell it as a non-powered hub (which are typically less expensive) but you have that option to power it if you need it, without buying a new one. I can't tell from the pics what the plug is, but 5V is likely a micro USB plug, like you use for your phone. So you are likely to have one laying around already. The Samsung Galaxy S6 charger is a 2amp charger which should be more than enough for 4 devices.

I have a surface pro. When docked on the keyboard, the usb port is on the right hand upper side. Is the cord long enough so it won't be dangling? Thx.

I do not have a surface pro. However the cord is approx. 62cm (24.5 inches or ~2 ft) long. Hope that helps. Maria

Does the main hub require the charger to work or just work better? Required for Charging port?

The power adapter is optional. For faster charging and hard drive connection, you may need one power adapter.

does the charging port also work like a normal usb so i can use it for a wireless mouse/keyboard for example or does it ONLY charge?

I'd say, although I've never used the "listed for charging" USB Port for a device. It would not work for a wireless mouse/keyboard. I can say this because when I have used that USB Port to charge my phone, when I plug the phone in, neither my computer or phone asks if I want to connect to the device. This and, if it was able to connect as a regular USB Port, I'm sure the MFG. would advertise it as an option..

Data Transfer Rate	5 Gigabits Per Second
Number of Ports	4
Operating System	8 . 1,Linux,Mac,Vista,Windows
Compatible Devices	Desktops, laptops, tablets, smartphones running Windows 10, 8.1, 8, 7, Vista, XP, Mac OS X (10.x or above), and Linux
Total Usb Ports	4
Hardware Connectivity	USB, USB 3.0
Additional Features	Intelligent Charging Port, Electronic Switch for Each Port
Item Weight	90 Grams
Item Dimensions L x W x H	4.13"L x 1.65"W x 0.87"H
Material Type	Plastic
Color	4-Port hub

USB 3.0 Hub, atolla 4 Ports Super Speed USB 3 Hub Splitter with On Off Switch with 1 USB Charging Port (Cable Length 2 Feet, No AC Adapter) (4-Port hub)

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