Would recommend this for a cat that has a chip. Otherwise, look at the cheaper model. Also experiment with the door. Two things don't make sense per the instructions: 1- why do you have to use the batteries when in the training mode, 2- why do you have to program the training mode, since it doesn't stay in training mode indefinitely, if that's what you want. Answer is you don't have to; but that'snot what the manual states, nor what the help desk states. Lastly, why do you have to separately purchase the disks in this model, when two come with the cheaper model. If your cat has a chip, get this one, if it doesn't, get the cheaper one, or ask them to throw in one for no charge.