Works great. Keeps my cats off my furniture. But it is expensiveI really like these, I would love them if they weren't so expensive, but they do work when many other techniques (spray bottles, double sided tape, etc.) do not even phase my cats. I have 5 cats and they are quite sneaky. They have learned not to go on the counters when we are in the room, but as soon as we leave it's a free for all. These are detect motion and spray a burst of air which startles them enough to get off the counter. To be honest, I have been sprayed and startled more than them when I forget they are turned on and walk over to the counter. I have a friend who has used it with her cats for years. Once they associated the can with the spray, she didn't even have to to turn them on anymore and they stayed out of that area with only the cans sitting there. She uses them on her stairs and can leave the can. I use them on my counters and after I while I get tired of looking at them (or of getting sprayed) and put them away until I notice the cats on the counters again and I get them out. If I was more consistent, I could probably leave the cans and they cats would stay off. It does have an easy on/off switch on the back. The cans last for a decent amount of time, considering I have 5 cats. Another feature that is really nice is the adjustable spray and motion sensor. You can angle both in different directions to be able to position it correctly to meet your needs. Like I said, I like them and they absolutely work - none of my cats will go near it. My only complaint is that is expensive.These are very inconsistent and way too expensive, but we need them so we'll keep getting them :( the directional setting is very finicky - works well on some and not on others. Sometimes it'll spray well and other times it won't spray at all, but it's better than nothing at this point and we haven't found anything comparable for our very bad kitties!These things work marvelously. I can even leave mine turned off, and the cats will avoid them. However, I have a few cats who watch me carefully and if I walk past one, they know it's okay for them too. So I have started making a PSSSSSSSSSHHHHH sound when I walk past and this seems to deter them. I just wish they weren't so expensive. The only complaint I have is that they get stuck and don't always go off, or they go off on a farther range than you would expect.What can (no pun intended) I say? It works, doesn't have an odor, the cat jumps out of her skin when it goes off. So it works but for a can of "air" it isn't cheap. If I didn't love the cat I might say that it isn't worth the cost but then that isn't the case so it is "worth every penny!'We just moved into a new house, and our kitties did what is not surprising and began to mark. It was easy enough to deal with on the carpets, until one of them targeted our sofa. We tried everything, the electric mats, boxes, anything to distract them from getting on the sofa. The absolute only thing that caused them to completely stop marking everything was the SSSCAT cans. We placed them everywhere there was a problem, and within a day the marking was done for good.SSScat is a great product! I have an elderly cat and several younger cats. My elderly cat is on a special diet , so I place two ssscats next to his hit and the other cats know not to come near his food. Also stops them from scratching at my door.This works to keep cats off the counter or away from certain areas of the house. The only thing I don't like is that when it is triggered, it sprays several times which makes it run out quickly. I would love it if it only sprayed once each time it was triggered.These are a ridiculous price and also two of them had the white nozzle rammed right in so they couldn't connect to the top attachment, neither could I get the nozzle dislogged so both cans had to be binned.Most of all they are at rip off prices.Mais demeure trop dispendieuxexcellent value and prompt shippingmes chats joue avec les cannes