Here’s a fun gadget that is bound to annoy everyone, the Annoy-a-tron 2.0, all you need to do is turn it on, set the annoying sound you want and hide it somewhere.

This new version of this annoying gadget comes with 6 built in sound effects, including a mosquito one that only young people can hear.

The 15kHz sound is also interesting because this frequency range of sound cannot be heard by everyone. In older adults or those with deteriorated hearing (a condition known as presbycusis) this high frequency sound will not be audible, while others will clearly hear the sound and find it quite annoying. They also might think they are going crazy when people nearby report that they don’t hear anything.

It also has a built in volume control so you can make sure the sounds are extra annoying.

The Annoy-a-tron is available for $12.99 from Think Geek.

via Coolest Gadgets