Finally help against the pesky hill

We had really persistent problems with one (or more) moles have dug up to 5 hills per week. This mole fright now finally came Remedy - initially we thought it's a flop, because the mole to welcome the first fright 3 demonstrative hill next to digging, but after 3 days it was gone and has not more (over 4 weeks !!!) surfaced .. So what more could you want. The beeping every 5 seconds is sometimes a bit annoying, but at some point you can hear the no longer probable.