Fitbit’s newest wearables were a hit with the press when they debuted at CES 2016 this year and now the company is celebrating a 1-million milestone quickly after launch.

The company has announced that it has shipped more than one million Fitbit Blaze devices in its first month of availability, exceeding internal Fitbit sales forecasts. During this time, Fitbit Blaze has captured the ranking of #1 bestselling device in both the smart watch and heart monitor categories on Amazon.

Fitbit also announced that more than one million Fitbit Alta devices have shipped since U.S. retail availability began on March 9. Fitbit Alta is also currently one of the top selling devices in the fitness tracker and pedometer categories on Amazon.

“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,” said Woody Scal, Chief Business Officer of Fitbit. “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.”

Fitbit Blaze puts the emphasis on next generation health and fitness features first and foremost, such as PurePulse continuous, wrist-based heart rate tracking; SmartTrack automatic exercise recognition; automatic sleep tracking; and FitStar by Fitbit on-screen workouts. The Fitbit Blaze includes the smart notifications that matter most, like call, text and calendar alerts, so you can stay connected to what’s important. It also has a long battery life that lasts up to 5 days1, allowing you to keep up with your life, day and night.

Fitbit Blaze and Fitbit Blaze accessory bands began shipping to retailers and consumers in North America in late February and are currently available in Europe, Middle East, Africa, Latin America and Asia. Blaze will begin shipping to China, Korea and Japan later this Spring.

Fitbit Alta ($129.95 U.S.) is a slim, sleek fitness wristband designed with a satin finish, stainless steel body and features a line of stylish, interchangeable bands in multiple popular colors and premium materials so you can find the right style for every occasion. Features include Reminders to Move, SmartTrack™ automatic exercise recognition, and all day activity and automatic sleep tracking.

Fitbit Alta also helps you stay connected with the smart notifications you need, delivering call, text and calendar notifications when your phone is nearby with a gentle vibrating alert on its vibrant, slender display. Fitbit Alta lasts up to 5 days1 on a single charge and is compatible with more than 200 Android, iOS and Windows mobile devices and computers.

Fitbit Alta and Fitbit Alta accessory bands began shipping to retailers and consumers in North America on March 9 and are currently also available in Hong Kong, Singapore and South APAC. Alta will begin shipping to additional global locations in Europe, Asia, Middle East, Africa and Latin America later this Spring.