The Basis B1 is already one of the most advanced activity trackers on the market, with the ability to measure information like heart rate and skin temperature. And it’s about to get even more comprehensive with the release of the Basis 2.0 app for iOS(s aapl), Android(s goog) and the web on January 21. Basis is adding advanced sleep analytics, which will make the B1 the only band capable of monitoring deep, light and REM sleep.

According to Basis, it partnered with researchers at the University of California, San Francisco (UCSF); San Francisco Veterans Affairs Medical Center (SFVAMC) and the Northern California Institute of Research and Education (NCIRE) in testing its sleep analysis technology. The B1 was benchmarked against other consumer and medical grade devices to make sure it provides a comprehensive picture of how you sleep. Here’s a quick rundown of what the band will be able to do: