ADAPTIL PHEROMONE REFILL IS DESIGNED FOR USE WITH THE ADAPTIL PHEROMONE DIFFUSER TO CALM YOUR DOG IN STRESSFUL SITUATIONS. THIS IS FOR USE WITH THE OLD STYLE DIFFUSER. WILL NOT WORK WITH THE NEW STYLE DIFFUSER. ADAPTIL HELPS STOP OR PREVENT FEAR AND STRESS RELATED SIGNS IN PUPPIES AND ADULT DOGS. ADAPTIL MIMICS THE PROPERTIES OF THE NATURAL APPEASING PHERAMONE FROM THE LACTATING BITCH; THE FUNCTION OF WHICH IS TO REASSURE THE OFFSPRING. ADAPTIL IS DELIVERED THROUGH AN EASY TO USE PLUG IN THE DIFFUSER. IT LASTS FOR 4 WEEKS AND IS ACTIVE FROM 50 TO 70 SQ.M. PLEASE NOTE: IT IS ONLY COMPATIBLE WITH THE UK POWER SUPPLY. FOR USE IN OTHER COUNTRIES YOU MAY REQUIRE AN ADAPTOR.