Critter warning device

[Ales Ogrinc <ales.ogrinc@telekom.si>]

For all those who have problems with small critters.
It is possible to buy a scaring device on the market (cca.20$). The
device is easy to install (you just connect the device directly to +/-).
The device  sends out high frequencies that small critters (rat,
mouse...) can't stand and scares them  away. The frequencies  are not
disturbing the human ear because you can't hear them. The device is very
small (cca 3*3 cm.) and it works OK.