Shoo! Tag Perfect for Cats - Flea and Tick non-toxic "Frequency" pest barrier! Shoo! Tag is an animal/people specific tag that uses frequencies targeted against specific pests. These frequencies are encoded onto the magnetic strip on the tag. The energy field of the wearer expands these frequencies thereby creating a non-toxic barrier against pests that lasts up to 4 months. * EASY TO USE * EFFECTIVE AND ECO-FRIENDLY * NO CHEMICALS * COSTS UP TO 40% LESS THAN LEADING TOPICALS * LASTS UP TO 4 MONTHS * We also offer Shoo! Tag products for dogs, horses and people. Shoo! Tag Perfect for Cats is available in the single pack for $22.99 and the 2 pack for $32.99