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Fitbit Inc. (NYSE: FIT) shares made a handy gain to start off the week after the company announced that it shipped more than a million Fitbit Versa devices since general availability began on April 16. Overall, this is a sizable number for the firm, demonstrating strong consumer demand for the product.

Additionally, Fitbit announced that more than 2.4 million users already have used its new female health tracking feature, which became available to all Fitbit app users last month.

Through Fitbit’s software development kit (SDK), over 18,000 developers joined the Fitbit’s developer community. Over 900 apps and clock faces have been built by the community thus far.

Fitbit offered some highlights from this release:

• More than 2.4 million users have added the feature to their Fitbit app.
• Some 1.8 million users have added at least one period to the calendar.
• More than 500,000 users have added two or more retrospective periods.
• Nearly 700,000 users have logged one or more symptoms.

James Park, co-founder and CEO of Fitbit, commented:

With Fitbit Versa, we are delivering on our promise to offer a true mass appeal smartwatch with engaging new features. The positive response to Versa shows that we are filling this void and well positions us to gain share of the fast-growing smartwatch market. The engagement we’ve seen with our new female health tracking feature further demonstrates the value our users see in being able to get a more comprehensive look at their overall health and wellness, in a single place, in a way that other available cycle tracking tools cannot.

Shares of Fitbit were last seen up about 2.5% at $5.66, within a 52-week range of $4.51 to $732.