Fitbit's new Alta activity tracker.

Fitbit Inc. said it has shipped more than 1 million units of the Fitbit Blaze device in its first month of availability sending the stock higher by more than 6 percent to trade at $14.30.

This number has exceeded the company’s internal sales forecasts and captured the number-one ranking as best-selling device in the smartwatch and heart-monitor categories on Amazon. The product has received 1,200 customer reviews giving it a 4- or 5-star rating.

The Blaze retails at $199 and is more expensive that the Fitbit Alta, which retails for $129. The Blaze has more features like heart-rate monitoring and music control causing the price to be higher. The Alta device is one of the top selling fitness tracker and pedometer devices on Amazon.

Fitbit Blaze will begin shipping to Asia later this spring and is currently available in North America, Europe, Africa and the Middle East. Fitbit Alta is available in North America, Hong Kong and Japan. It will begin shipping to Europe, Asia and Africa later this spring.

Coverage on Fitbit was initiated with at Longbow Research with a Buy rating and a price target of $20. Fitbit stock has had a rough year. It has dropped 51 percent , plunging from a 52 week high of $51.90 down to a low of $11.91.

Fitbit competes against Nike’s Fuel band and Jawbone’s Up device. There are also products from Samsung and Lumo Body Tech and the Apple smartwatch.

A recent report from Argus Insights found that consumers are happier with their devices than they are with the fitness apps that work with the device. The Fitbit app rated low in consumer satisfaction, while the Nike and Jawbone apps received high praise.

Along with this tough competition comes lawsuits. Jawbone and Fitbit have been suing each other over trade secrets and patents. So far, Fitbit has defeated four of Jawbone’s six claims, but the bad blood isn’t over between the two and more suits are expected.