After a 20 second delay your Sonic Grenade will sound its annoying alarm continuously until you replace the pin. Very annoying! Probably the most annoying device in the world. Wake recalcitrant teenagers annoy parents or teachers interrupt meetings etc.

With three annoying pitch levels there is no end to the torture. Did we mention it`s annoying?

Requires 3 x AAA batteries (not included). 125 mm high.