These work great! Put a tiny bit of peanut butter all the way in the back and they go right in and get caught. I had set these for 3 hours when they caught the first mouse. Here is a tiny bit of info to help you catch the mouse. Make sure that it is laying on the front end when you set it and not the back. The motion of them crawling in to the back is what makes the trap go off. I didn't give it 5 stars because it would be better if it were see through but really you can feel the weight change when you pick it up and just turn it to flip it and you will hear the pitter patter of the claws.