Allotments 4 All

Has anyone got any experience of the ultrasonic rat scarers, just seen that you can get some battery operated ones for around a tenner and if they work a tenner doesnt seem a bad outlay for no rats.
battery life is quoted at 2 - 4 months using a pp3.

Glow

used mine for a mouse issue at home -  htey do not like it but get used to it after a while and then just ignore it (although i saw them jump when i switched it on the first time which was pleasure enough )   -  a friend said his rat used it as a urinal  ;D

effectiveness is limited but it will annoy them -  so they might move.   i caught a couple and since then (touch wood)  i have not seen any mouse activitty since

There is no evidence that they do actually work, this is just one of several thousand possible links I couls post saying that. http://www.livingwithbugs.com/electron.html

Some companies have been prosecuted for misleading people with claims that these devices do actually work.
http://lancaster.unl.edu/pest/resources/ultrasonicdevices.shtml
http://www.ftc.gov/opa/2001/05/fyi0128.shtm

A fen trap on the other hand costs around £4 & does actually work.
http://www.molemann.co.uk/item.do?item=54

For my two pennorth

Get two boxes of moth balls, if your worried about things eating them cage them so the smell gets out but they cant be got at, then spread them out .....

Ill rephrase that, spread cages about with mothballs in the cages

they really dont like the smell

mrf94

If you want somethng that will definitely work, use either fen traps or poison. Even if you scare them off, how far will they go? I bet they get used to the noise; they're intelligent enough to realise after a while that it doesn't do them asny harm.