Question 1

Does this dock have a power On/Off button?
I.e if  I connect my Dell  m3800 to it, can I power the laptop on, as I plan to have the laptop under desk

Accepted Answer

For the Thunderbolt (USB-C) docks, YES.  For the USB 3 docks with the USB type A connector, NO.  Basically, Amazon is not doing us any favors here by lumping the USB 3 and USB C docks into one product listing, when in fact they are completely different products.Let me break this down for everyone so it's very clear.  To answer the original question specifically, NO.  The Dell m3800 does not have a USB-C port, so you would have to order the USB 3 dock, which does NOT do what you're asking.  If, however, you have a newer Dell model, such as a Precision 5510 or one of the newer XPS models with a USB-C port, then you can order the Thunderbolt dock.  That dock DOES have a power button on the dock itself which will allow you power on the connected laptop without having to open the laptop lid and press the on-board power button.Hope this helps!

Question 2

Is this 4K @30hz or 4K @60hz

Accepted Answer

I have USB-C Dual monitor version. It only supports 4K @ 30Hz for one display.

If the main display is set to 4K, the second display (connected to VGA port in my case) is capped at 800x600. It only allows to go higher than 800x600 if I lower the resolution of the main display.

Question 3

I need plug a power cable to use it or the energy comes from the notebook (plugged with power cable)? The notebook energy comes from the dock ?

Accepted Answer

That actually depends on which of the docks under this listing you are asking about. The docks that connect via USB Type-C will actually power the notebook without having to plug the notebook in as well, so you just have to plug in the power cord for the dock. Those, of course, require that you have a notebook with a USB Type-C port and that the notebook's power requirement is no higher than 150W for the "Dual Display" model (the Dell XPS 15 9550, for example, falls under these conditions) or 180W for the totally-not-worth-it "Triple Display" model. The docks that connect via USB 3.0, however, do no such thing, and the laptop and the dock both need to have their separate power cords plugged in.

Question 4

If a Dell Laptop (e.g. XPS13) is connected to the dock by a USB 3.0 cable and the Dock is connected to the mains, does the laptop get charged?

Accepted Answer

Just to clarify - the question is does this CHARGE my laptop via "USB 3.0"?  The answer is NO, the USB 3.0 specs do not provide for charging the laptop, doesn't matter who the manufacturer of the laptop or dock is.  Those that replied YES are referring to USB-C which is a different specification.  Finally - the XPS13 has been around for about 10 years, so the older models do not have USB-C.  Read and understand questions before you answer.

ASIN	B00O0M46KO
Best Sellers Rank	#2,095 in Computers & Accessories ( See Top 100 in Computers & Accessories ) #175 in Laptop Docking Stations
Brand	Dell
Color	Black
Compatible Devices	Dell Notebooks/ Tablet PC
Customer Reviews	4.4 4.4 out of 5 stars (11,111)
Global Trade Identification Number	05397063644230
Hardware Interface	USB
Item Dimensions L x W x H	20.7"L x 15"W x 11.2"H
Item Type Name	1
Item Weight	10.08 ounces
Manufacturer	Dell Accessories
Mfr Part Number	D3100
Model Number	D3100
Number of Items	1
Number of Packs	1
Number of Ports	6
Total Number of HDMI Ports	1
Total Usb Ports	7
Unit Count	1 Count
Warranty Description	No Warranty
Wattage	4.5

Dell USB 3.0 Ultra HD/4K Triple Display Docking Station (D3100), Black

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