If there was an electronic device that claimed it could make you feel relaxed (extremely relaxed) or energised (extremely energised) would you buy it? Thync is a new breed of 'mood-altering wearable' that promises it can do both.

We got one of Thync's devices – which retail for $299 – into the Guardian office, and strapped it onto resident guinea pig Adam Gabbatt. We then zapped him with calm over a 25-minute period. Maybe too much calm