I TRASHED THEM!
Bought 6 of these cat collars. Followed instructions, fit collars loosely on my 6 indoor cats. My 9 lb. cat started experiencing listlessness than upper respiratory symptoms. I removed collar and later that day- was back to his well self. My 17 lb cat started experiencing upper respiratory symptoms, I removed collar and his fur is gone where collar was. I than removed all the Hartz collars from my cats. I washed all my cats necks and trashed these collars. I purchase different Hartz products throughout my life (I'm 63) and have been satisfied. But this Hartz cat collar I would never recommend.
Oldfloster
Fairmont WV