Fitbit's newest trackers have made quite an impression with customers despite only being available for less than a month. The company announced that it has shipped over 1 million units of the $200 Blaze smart fitness watch and 1 million units of the $130 Alta bracelet-esque tracker since they became available in early March.

This comes as a surprise, as most people, particularly Fitbit investors, were confused when the Blaze was announced at this year's CES. Although it was never meant to be an Apple Watch killer, it certainly looked similar at first glance, and that raised a lot of eyebrows. Immediately after the Blaze launch, Fitbit stock dropped 18 percent.

The Alta was announced shortly after the Blaze as a more stylish alternative to the existing Fitbit Charge. In terms of features, however, the Alta and the Charge have few differences, and their prices are identical at $130. At first it was unclear where these devices fit into Fitbit's lineup, but if these sales are any indication, it appears customers are embracing the new devices.

“At Fitbit, we continue to focus on developing innovative and motivating fitness-first products that our customers love and that help them achieve their health and fitness goals,” Woody Scal, Chief Business Officer of Fitbit, wrote in the statement. “The positive response we’ve received to Blaze and Alta demonstrates our continued ability to innovate and drive strong demand for Fitbit products, which is what has made and kept us the leader in the global wearables category.”

According to IDC, about 78.1 million smart wearable devices shipped in 2015, and Fitbit led the pack with 21 million devices shipped. These promising sales will likely put some Fitbit investors at ease for now, but the year has only begun. Apple was third in line last year, shipping 11.6 million units of the Apple Watch (right behind Xiaomi's 12 million).