The market for smartwatches is associated with an estimated 43.87 million unit shipments in 2018. However, this number is now thought to reach a possible total of 108.91 million by 2024. This growth may be driven by an increased demand for health- and fitness-management, as well as standalone connectivity, in these wearables.
https://www.notebookcheck.net/The-smartwatch-market-could-break-100-million-units-shipped-by-2024-new-market-research.459854.0.html