They work but sometimes when my 1 dog shakes her head the ears flapping set it off. I’m not happy with the shock part. I tried it on myself & it did hurt but my 1 dog likes to set it off. So I just keep it on vibrate & that does the job to stop the barking & jumping. It’s worth it if you use it properly. Now they see them & I don’t have to turn them on all the way. It’s worth the purchase just beware of the size of your dog & test it on yourself 1st so you don’t hurt them please.