The Snapdragon Wear 3100 was Qualcomm's latest dedicated SoC for smartwatches - until today. It has been supplanted by the new 4100 - as well as the 4100+. Both feature a new processor, paired with an ultra-low-power co-processor. The 4100+ distinguishes itself with an exclusive chipset for enhanced always-on displays.
https://www.notebookcheck.net/Qualcomm-launches-the-Snapdragon-Wear-4100-platform-complete-with-a-series-first-Plus-variant.478717.0.html