I'm sorry, but I've been very diplomatic. They
are cruel, and they
are painful. Like I said, the manufacturers say it's a static shock, because I don't think anyone would buy them if they worded it as "electric shock" which is what it is. They have been banned in Wales and there is a movement for them to be banned in the rest of the UK. The RSPCA, Dogs Trust, Kennel Club are all fully wanting them to be banned. The kennel club even refers to them as being 'barbaric'. I agree.
Amber, you say you want your cat to go out and enjoy the garden and sun. What could happen is because of the pain your cat will receive he will associate the garden with negative things ie pain. He might not want to go out in the garden and could become fearful of it.
http://www.friendsofanimals.org/actionline/Fall-2007/good_intentions.php"Yet as sales have risen, so has the outcry about the adverse effect of shock devices. Several countries have banned or severely restricted shock collars, including Denmark, Australia, Germany, Switzerland, Austria, Slovenia and Wales. A bill to prohibit them is currently pending in England.[4] When they were being considered for a ban in Wales, which became effective last December, Environment Minister Carwyn Jones pronounced them “totally barbaric.”[5]
Scientific research has cited the harmful effects of shock collars. A July 2005 report by Esther Schalke, of the University of Veterinary Medicine at Hannover, Germany, found elevated heart rates and levels of cortisol, a stress hormone, in the saliva of 14 beagles
trained with electronic collars. Schalke’s report concluded, "The general use of electric shock collars is not consistent with animal welfare"
I have an indoor cat and of course a litter tray indoors and it's not a problem. It doesn't smell. Ok, so immediately after he's had a poo -once a day- but other than that the tray never ever smells.
I know, I'm probably sounding horrible right about now. But I honestly just have the best interest of your future cat in mind.