Mosquito Incognito

This little box is definitely one for the armoury of any practical joker.

Designed to emit that infuriating buzzing noise of a mosquito on the hunt for its next meal, the Mosquito Incognito is light sensitive, so turn on the lights, and the noise stops, as soon as it's dark again the buzzing begins.

Cruel but amusing, the Mosquito Incognito comes with batteries included.