Remote doors are tough and sturdy doors which rely on the use of automated technology. In other words, they cannot be opened with a traditional key.
Remote doors must be paired with a functioning door servo in order to be opened. Aforementioned door servo must be connected to any mechanism capable of activating it in order for it to work correctly. Such mechanisms may include but are not limited to:
Remote doors make it so that in a situation where a prisoner steals the keys from a guard, they are unable to progress any further through your facility. However, remote doors are not indestructible - the prisoner may resort to beating it down through brute force instead.
Remote doors have no specific circumstance in which they must be used. However, for places where extra security is required, the remote door may be a good fit.