NOT A GOOD IDEA
I have had ferrets for years. Every ferret owner should know they are ADDICTED to anything rubber. If you have one fuzzy, this may work. I have two and they were pulling it off each others neck. The idea was great but not executed well. The beeping that occurs when you try to find them is very low. If they are buried in your couch, it is very hard to  hear and find them. The collar is not very secure and it slips off also. The GPS option would be great if they were lost, so that option was a good idea. Three stars for the GPS.
Rating: 3 stars