Spotlight cam pro plug-in

Camera arrived this week but a bit unclear on the installation.The 6m cable has an adaptor approx 2.3m from the camera which severely restricts where I fit it outside. the rest of the cable is attached to a 3 pin plug. I really need more cable outside but can’t establish if the adaptor can be fitted outside and if I were to do so would then have to cut the 3 pin plug off and fit another to replace it.Questions then are - can the adaptor be fitted out side?if it can - can I disconnect the wire from and refit after pulling the cable through the wall?As ever all advice gratefully received.