Compared to traditional déboulocheur found everywhere and that does not last, it is very effective! Hint: try on a hidden part of a previously vétement because I kinda dug a fleece jacket. A little help to take and hop, all spring as new. Very effective, requires 2 LR6 batteries not included. Remains to be seen in time but for now it is much higher compared to other tested. The battery consumption seems a bit greedy (2 sweaters and fleece), but this is the price of effectiveness. Safe Shopping, you will not regret it!