According to foreign media reports, Apple announced at this year's Global Developers Conference HealthKit shows that the company is likely to be developing wearable devices. As release time approaches, investors may begin to think about the potential of Apple's wearable devices. From HealthKit to iWatch HealthKit is the clearest clue from Apple that the company plans to release iWatch this year. HealthKit will serve as a developer's tool to bring health and fitness apps together. HealthKit creates a central database of key physiological indicators collected by smart devices - such as heart rate and burning calories. Apple said on its website, "Health stores all its data in one place, giving users a quick, easy access to the data and a clear understanding of their health." Re / code, a technology blog site, reported last week that Apple plans to launch a HealthKit-enabled wearable device in October, one month later than the usual time Apple released the iPhone, with Apple unveiling its new iPad and Mac in October last year. iWatch blockbuster it? According to the Nikkei Asian Review, Apple apparently believes that Apple is very confident of iWatch, plans to produce 3-5 million units per month, which means that the annual output will reach 36 million -600 million . This is a huge figure given the 19.5 million units sold in the first year of iPad. iWatch annual sales reached 36 million units, equivalent to more than half of the iPad sales in the past year. In the past 12 months, iPad sold 71.8 million units. If iWatch sales can achieve such a high level, Apple may bring a revolution in the field of smart watches. Sales of smart watches in 2013 was only 500,000 units, iWatch sales of 3 million to 5 million units per month will make sales of smart watches worth mentioning in 2013, analysts estimate the future potential of smart watches is also quite conservative . Canalys, a market research firm, estimates that the global sales of smart watches will reach 8 million and 23 million respectively in the next two years. If Apple can achieve its goal, Canalys and many other market research companies may greatly underestimate Apple's contribution to the smart watch industry. Given Apple's conservative valuation, iWatch's success may provide investors with long-term upside.