Brainwave reading headsets are nothing new but the top models are quite costly. The NeuroSky MindWave Mobile 2 is an affordable EEG headset that lets you see how your brainwaves change in real-time. It measures and transfers brain data to your iOS or Android device.
The MindWave Mobile 2 consists of a headset and a T-shaped headband. It lets you try more than 100 brain training games and apps. You can even write your own programs. The MindWave Mobile 2 is available for under $100 at this time.