I choose this note 3/5 for the following reasons: This device is effective against moles, mice ... so it did its job. By cons, it is particularly fragile, "very cheap", it is not strong and I doubt its duration in time. The thread to unscrew and screw the top ESTNot not very strong and holds only the last quarter turn. The little blue lamp (equally useless gadget, I grant) has been running for 4 or 5 days.