Garmin Trash Breaker 9 collar system, with 6 collars and transmitter. Never purchased the other three collars to make 9 total. All collars respond to the transmitter but two of the collars the rubber around collars cracked or broke but all collars seem to work. Owner (my brother) of these don't do dog hunting anymore and UFD. Posting for him. PM for info! Lady Lake, FL. 32159 (Central FL) MAKE A OFFER, NEED GONE! I already have two systems myself! Thanks 352-638-0429