This newly designed (2024 version) RFID tag by PawsPik is exclusively compatible with PortionPro Rx Feeders. It features silicone loops for easy collar attachment and a sleek, smaller size for a comfortable fit on your pet's collar. The battery is easy to replace. It is recommended that each pet in the home has its own tag. The tag communicates with the PortionPro Rx feeder through a unique RFID system. By default, the tags are unpaired, you can easily program them to be paired. Once the tag is paired you can either approve or unaprove the tag's access to the feeder. When approved tags approach the feeder, the food bowl door will open, allowing access to the meal. Additionally, when unapproved tags approach, the door closes to prevent food stealing in multi-pet households.