Its a basic kit:  the end user needs to supply and install the OS, ddr3 ram, SSD/2.5" drive, video monitor, headphones/mic or speaker, mouse, and keyboard to see and hear what it does.  Only the input/output ports, motherboard, graphics, wifi/bluetooth chip and Celeron CPU are installed in the metal and plastic case already.  It comes with a multi-national 120v input/19v output power brick also [has several different plug selections].  With keyboard, pointing device, video monitor, 8gb ram and 120gb ssd installed, it draws about 1/3 of an amp [around 30 to 40 watts in minimum configuration].  Check the Intel website to discover compatible OS, RAM, and SSD/hard drive and video monitor brands.  I've only had it a week, and have not tried the audio yet.  I used OS, RAM and SSD from the Intel compatible list.  I'm using a generic keyboard, Logitech marble mouse, and very old, not-supported, 22" monitor which is working ok. Note that the NUC came via USPS flopping around in a shipping box with no padding.  But it does work even after being knocked around a bit during shipping.