These traps are NOT EFFECTIVE and DO NOT KILL MICE. I had two baited with peanut butter and every morning for a week discovered the bait GONE. Then I set up a camera and recorded Mr. Mouse in action as you'll see in the video. The next night I took a piece of cheese and GLUED it way in the back of the trap. This caught the mouse, yes, but only by the tail. He was unhurt and spent the rest of the night chewing this plastic trap into shreds. The next morning he was still caught but plenty alive and I had to pick up the wrecked trap with the live mouse in it, take him outside, and open the thing with my foot so he could run away. NOT RECOMMENDED. Go for the cheaper (and much more effective) standard wood/wire traps.