Took a few tries to learn how it works but now that I figured it out I kill each mole within about 1-2 days of first seeing the tunnel. The trick is to find a tunnels they will use again and then just press the trap down over it so when they come through again and push up .... SNAP! you have a dead mole. I've killed 4 moles with this in the past couple months. Just ordered a 2nd one to help with this mole infestation.