Super handy little device to keep you safe when tinkering with all things electric round the house, checks if anything is live before you take a screwdriver to it!
Cheaper than most, if not all, that I have seen anywhere else, and definately cheaper and more useful round the house than a full-on multi-meter.
From the site;
"Non-contact (voltage detector). Checks fuses in consumer units and if there is voltage in wall sockets. Easily finds out which of your christmas tree lights is broken, etc. Buzzer and LED indication. Built-in LED lamp. Operates on 2x AAA/LR03 batteries (not included). Plastic casing with pocket clip."