Questions about Dell UltraSharp U2724D

The monitor requires a power supply of 100 to 240 VAC at a frequency of 50 or 60 Hz, with a maximum current consumption of 1.6 A. In operation, it consumes around 23.9 watts, while the maximum consumption is 85 watts.

No, it doesn't

I only got the EU (German) one....

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2560 x 1440 pixels can be set after performing updates.

The package also contains a display port cable. You can connect the monitors together using one of the display port (be sure to use the correct port on the monitor, check for Daisy Chain) and then if you have the correct adapter you can use the second display port cable to connect master monitor to your laptop/workstation. In case you have no display port support/adapter you need to buy an extra hdmi cable

DisplayPort cable, power cable, USB-A to USB-C cable The power cable has a Schuko plug