Thync, $199

thync trial

Thync, a wireless device that zaps your brain, promises to make you calmer or more energetic. All you have to do is stick the gadget to your head and let it beam you with low-levels of electric current until you get there (typically about five minutes). Thync was developed by a team of neuroscience and biomedical engineering experts.

First published December 22, 2015: 2:55 PM ET