Screw size for Ring Stick-Up Cam 3rd generation

Hi. I've lost the box in which I carefully placed the wall mounting screws for the swivel-base of my Stick-Up Cam (3rd Gen). Can anyone tell me what size screws are needed to mount the base on an exterior wall? The screws are clearly smaller than the smallest that I currently have (No. 4) and also I don't know the length. (Ring want me to pay £21 for a mounting kit rather than tell me the size of the mounting screws!!!)