Zotac is a major player in the SFF PC space, and the emergence of the ultra-compact form-factor (UCFF) NUCs has broadened the available market for ther mini-PCs. The company markets their passively-cooled machines under the C-series moniker. Their C-series nano units adopt a form-factor very similar to Intel’s NUCs, providing performance and thermal efficiency commensurate with their size.

The company’s latest models, the CI6xx nano units, are based on the Kaby Lake-Refresh U-series processors, and they aim to improve on the older C-series units by adopting a larger form factor and adding more platform features.
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https://www.anandtech.com/show/14157/zotac-zbox-ci660-nano-fanless-minipc-review-a-promising-htpc-platform