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Hi and welcome to the forum @Upgrade,
As you may or may not be aware, the NOW TV service permits you to register up-to four playback devices onto one NOW TV account and view their service on up-to two playback devices at the same time.
You can find out which playback devices you currently have registered by selecting the: 'My Account' button and accessing 'Manage Devices'.
So yes you can buy a 'smart' box and can add it to your existing NOW TV account. And keep your 'kids' pass 😉