Some units may ESCape. Reboot the system by calling its name. Units take turns as one is the data and the other attempts to parse it. Some CAT units are very efficient bug hunters. This takes 20 hours in a 24 hour cycle.
CATs are self cleaning and require little user maintenance.
Do not clean the unit with alcohol or benzine-based solvents. This may lead to a violent explosion. There are no user serviceable parts inside. You may examine the rear of the CAT unit to determine if it has a male or female scuzzy port. CATs with a male port may emit a non-toxic aerosol.