According to a press release, the Halo Rise is a bedside device that will wake you up in the morning with lights and a small alarm speaker. The Rise uses contactless technology, which means you don't have to wear a tracker or watch for it to work.
The company says that it doesn't have cameras or microphones, but that it does have built-in sensor technology. It seems plausible that the company is using something similar to the tech found in some Echo devices. As long as you are the one closest to the Rise, Amazon will be able to pick out your breathing from theirs.
Environmental sensors are built into it to gather data on things like your room's temperature, humidity, and light levels. It will give you a report about your sleep in the morning. When deciding when to wake you up, it takes into account where you are in your sleep cycle, as well as the time of day. It is difficult to figure out what stage of sleep someone is in, and the devices that can do it are not reliable.
You will be able to ask an echo how you slept, and it will base its answer on data gathered by the Rise, and it will also be able to detect when you get into bed. If you want it to stay your favorite song, I don't think it's a good idea to sync your voice recorder with the alarm to wake you up.
This will be available later this year. It also comes with a six-month subscription to Amazon's fitness service.