Virtual reality
Around the same time, Douglas Engelbart used computer screens both as input and output devices. In 1968, Ivan Sutherland, with the help of many students including Bob Sproull, created what was widely considered to be the first head-mounted display (HMD) system for use in immersive simulation applications. It was primitive both in terms of user interface and realism, and the HMD to be worn by the user was so heavy that it had to be suspended from the ceiling. The graphics comprising the virtual environment were simple wire-frame model rooms. The formidable appearance of the device inspired its name, The Sword of Damocles.
NeuroSky
Research Products: Neurosky has produced a number of research products (generally very similar to their direct to consumer products ). These products have been widely adopted due to positive reviews by early adopters with Richard Reilly Ph.D., professor at Trinity College in Dublin stating that, “We have been impressed with the quality of data from the MindKit Pro, compared to our gold-standard EEG acquisitions system. It has opened new possibilities for the remote monitoring patients’ activity a great benefit in patient care.” 
Mind Kit & Mind Set: The Mind Set (referred to as the Mind Kit in early press releases) was NeuroSky's first direct to consumer product. With a number of prototypes sold in 2007. The Mind Set was the first direct to consumer BCI product under $1000 ever made. The MindSet consisted of headphones with three sensors on one ear piece and another on a flexible arm coming off of the headphones that sat on the forehead. The headphones had a wireless Bluetooth connection and came with a small Bluetooth dongle. The first non-prototype models were sold for $199.