RFID feeder

Hi. I bought the water fountain that syncs with the RFID tags attached to the cat collar. It works like magic. I bought the feeder too, but since they are kitties, I don’t want to use this functionality that you name a feeder for each cat. Can I use both for both cats and it just tells me who is eating and how much like the water fountain does? Also, if they lose the collar in the house, does it mean they will not be able to open the lid to eat? Can I leave it open and have the feeder recording who is eating and how much they eat each time? I haven’t opened the boxes yet, because I am afraid they won’t work for my kitty cats. Any help?