After 72 hours, the CAT will be interacting with the operating environment. The unit may be placed in direct sunlight. If all basic environment requirements are satisfied, the CAT system will produce a slight hum. This is normal. A new CAT should not exit the primary site facility.
Full portability comes after extensive burn in.
Some users never let the CAT unit auto exit the site. The advantages are longer unit life and fewer bugs. Contact with untested CATs may lead to virus infection. If allowed to exit, some CAT units may try to port across a street. Fatal errors may happen.