You're looking to buy the E2Dual karaoke system and you've read about the unlimited access, subscription based streaming server. Then this page is where you want to be!
The new MagicSing series connect to a streaming server. On this server there are lists with songs in several languages available. This database of songs is a growing database with regular updates of the latest new songs. If you don't want to pay for a subscription, you'll always have access to a free pop-list with 10.000 free English songs.
If you however want to enjoy the full unlimited access of the streaming server, subscription is required. You can purchase a voucher card that'll give you full access to the server for: 2 weeks, 6 months or 12 months.
Together with the free updates comes an online battle mode, access to all languages available in the app and many more cool features!
Speaking of the MagicSing app, you can read all of that here.