Unlike some other inexpensive five stringed violins, these have a wider fingerboard so that yes indeed you can, with practice, play all five strings. The extra string is a C, in case anyone is in any doubt. These are fitted with Thomastik Vision strings not Dominants (in order to get the C string).
Since most people ordering a five string will be established players already, these are offered as violin only. I do not recommend these instruments for beginners. Also they will only ever be obtained to order so please make sure that you really do want a five string before ordering. This does not affect your statutory right of return but these sell too slowly to allow people to try them purely out of curiosity.
For the sake of the search engine: 5 string