chess game from 1984

[xmark1234]

Hi all ive brought a chess game from charity shop for £1 new sealed and unused i was wondering if anyone knows how much this is worth its from 1984 i carnt find it for sale anywhere can any one help
Its called portachess 2 electronic chess game fount it on internet but can not find a price on this
Will it be worth keeping or not i ask
Cheers guys