Monorean: rice-grain-sized spy earphones

Monorean makes the smallest headphones for cheating in exams.

How do they work

Monorean -

These are miniature headphones designed forcheating on tests and exams. They work exactly the same as any other similar devices - you just need to connect them to your smartphone via Bluetooth and call the right person. Monorean easily attaches and does not fall out of the ears when tilted.

The headphones themselves can be bought for 349 euros atofficial website. For the most advanced, there is the Monorean Pro kit for €549, which includes a paper-thin inductive collar. With it, you can discreetly accept an incoming call or switch an MP3 file.

Source: Monorean