Currently, Microsoft's Continuum feature is reserved for its cream of the crop, the Lumia 950 and Lumia 950 XL, and will also be supported on flagship-class devices from other manufacturers, such as Acer's Jade Primo. Luckily, it looks like Microsoft might bring the feature to its other handsets in the future.
According to WMPoweruser, Microsoft confirmed that the Continuum feature will be arriving on more handsets. This tidbit of news was uncovered at a Lumia launch event in India during a Q&A session. Unfortunately, Microsoft did not confirm when this would happen or what phones would be supported. When questioned about the feature further, Microsoft declined to comment.
Naturally, one might hope that existing handsets, like the Lumia 930, 640 and others, will be supported - but it seems far more likely that the feature will continue to require newer hardware.
If you have yet to check out Continuum, be sure to check out the video above or read our hands-on.