Used petporte smart cat flap (Hereford HR1)

It fully works, I have the box but no instructions. Guess they're on YouTube or online somewhere. Please note this is about 15 years old, so well used, but all parts present and fully works. You scan the chip under the hood, it recognises your cat (can do multiple) and let them in. Just need to make the hole. Just removed today after my very elderly cat said Goodbye yesterday. Needs a nearby 3 pin plug point and has back up battery. Will replace with a new one. Collect HR1 evening or weekend. Thank you. Jonathan