That depends. If you say der DVD-Spieler or das DVD-Gerät.. then the Gender is determined by the "unsaid noun"...

In Swiss its s'Coci which then becomes das Cola - in German, die Cola...

In French, usually things ending in -ing are "le" e.g. le windsurfing (la planche a voile)


So I think most native speakers would know from experience or by thinking of the "unsaid noun" what to call a new item