First time I thought its not exactly working. I put on the collar and nothing happened except from the regular feeling of excitement having a collar to your neck. Then it happened after listening to the file 5 or 6 times, I said well this file is not exactly a master piece. But than come the amazing part I woke up before a day wearing the collar don’t remember putting it on, I am sure I didn’t go to sleep wearing the collar. Today also happened something wicked, I almost went outside wearing the collar, not feeling it on my neck although it's kind of restrictive collar. So to summer things up this file is working. The file is working maybe not at first time but it sure works.