Never heard of it but here's a review I found that might be of interest to you;
HERE....
One problem I have with this - and if you read the review you'll see what I'm talking about here - is that the writer used the device on a dog who was on it's owner property while the writer was 'trespassing' - if I'm understanding his review properly. That's just wrong. If someone did that to my dog they'd better have a Dazer that works in my frequency. I would have been sympathetic if the guy had been 'attacked' but geeze... nasty thing to do to a dog on its own property!
If you've got a problem with dogs being untied, running loose, etc. while you're out walking, running, biking, etc., then certainly defend yourself but in the meantime call the town's animal control or police and make a complaint about the issue - that's really the bigger problem is the owners aren't doing their job.
This isn't directed at you - don't take offense to this - it's directed at the well-meaning but ignorant owners - it never ceases to amaze me that people will adopt dogs and then not follow the laws and use basic common sense to keep their pets healthy, safe and from being a nuisance.
Good luck - stay safe.
