The neem oil is incorporated by the polyethylene backing in its entirety. Thanks to an exceptional production experience, a small amount of oil is released every day. After 72 hours the collar gives its full activity and guarantees a long-term duration of 2 months. The collar can be worn permanently and is not affected by water. How to use: Remove all packaging and the metal clip. Activate the collar by stretching it a few times. To ensure the safety system, open and close the collar several times. Fasten the collar around the pet's neck, ensuring a comfortable fit, and trim off any excess.