You negotiate it between the buyer and seller. You can take everything, or leave everything if you agree. Otherwise the default if not excluded in most contrac

You negotiate it between the buyer and seller. You can take everything, or leave everything if you agree. Otherwise the default if not excluded in most contracts in the US would be to leave nearly all of it. Kind of like keys, even if something is not permanently affixed to the home it is "annexed" and transferred with the home when it is part of the customized home automation system. So the thermostat is part of the real estate even though it is wireless. The motion sensors and door bell are both annexed, and fixtures as they are attached with a wire. The lightbulbs are one thing that is probably not annexed or a fixture, it is a grey area, but potentially are addressed specifically in the contract like curtains.