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Bluetooth is a function of the wifi module, not the NUC. In the past all NUCs (like most PCs) required that you add a wifi module for wifi and/or bluethooth. The DN2820 is the first model where Intel provides the wifi module for free. It's meant to be a very low cost model and the idea was to make it as inexpensive and cost-effective as possible for an end-user to get it up and running. It also makes it easier to work with because the user doesn't have to install the module and connect the antenna wires.
The more expensive NUCs leave the slot empty to give the user choice in selecting which module they want. They may want wifi, bluetooth, both, or neither. They may want widi or not. Since the i3 and i5 are meant to be more versatile the user is left to decide what features they do/don't want. The modules can be anywhere from $10 to $100 depending on features.
Thank you for a quick, precise and helpful response.
It does make sense though it also makes the device even more expensive. My guess is that a lot of people buying a device like this want to keep it as minimalistic as possible on an everyday use and thereby free of network cable. I think that some kind of Wi-Fi will be needed by more than 2/3 of the people buying a NUC. Okay you can then have it tailored to your needs as you describe but it just makes it more complex for users as the one seen on your advertising image (marquee-man-at-monitor) to make the final step and buy it if it gets to techie to figure out what PCIe Mini Card to buy. My guess is that the Marquee man at monitor doesn't even know what a PCIe (Half Length) is.
I love the NUC product line and I have the feeling that they are selling very well (the DB2820 is sold out in northern Europe where I live). I just think that i3 and i5 would sell even better at regular people if it was added as part of the standard product. An Intel Wireless-N 7260 (PCIe HL) that includes Wi-Fi, WIDI and Bluetooth cost just $23 in Denmark. I am sure that Intel's production cost of that card is somewhat lower and that including it wouldn't make that big a difference on the price tag... but give better product value for many consumers.
Thank you for the attention,
P.S. Wold the Intel Wireless-N 7260 work on the NUC's?