The Flea & tick stop collar protects your pet against parasites for up to two months. Mechanical immobilisation of fleas, ticks, mites, lice and other external parasites. Based on dimethicone and without chemical insecticides. The dimethicone is gradually released and spreads over the coat and skin. This blocks the joints of the parasites and immobilises them. This product is water-resistant, so it continues to work after washing. Fit the collar comfortably around your pet’s neck and cut off the excess length. Change the collar after no more than two months.