Will I require an existing internet connection to use the Express, or can I use It's wireless features offline?

I would like to know if if can use the Airport Express without an internet connection?

I have a Mac Pro, currently I must set up an ad-hoc wifi network each time I want to connect my iPhone and iPad wirelessly to my Mac.

Will the Express allow me to create a lasting wireless network (as opposed to having to set up an ad-hoc network whenever I want to connect my devices wirelessly to my Mac?)

I receive my internet through my iPhone's wireless hotspot connection, so I do not have a router.

AirPort Express

AirPort Express

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