Garmin has announced a new sleep-tracking band that can be strapped to your upper arm, which could make it more comfortable to wear overnight. The Index Sleep Monitor tracks sleep stages, heart rate, and even your breathing to create a “comprehensive view of overall fitness and recovery,” with a personalized sleep score delivered every morning so you know how well you slept, according to Garmin.

The Index Sleep Monitor is now available through Garmin’s online store in S-M and L-XL sizes for $169.99. The tracking is handled by a small, removable electronic module that features motion sensors and an optical heart rate sensor that Garmin says will run for up to seven days between charges.

In addition to tracking your light, deep, and REM sleep stages throughout the night, the Index can also measure your respiration rates, and, when paired with blood oxygen saturation measurements (a feature not available in all countries) it can help you “better understand shifts in breathing patterns while sleeping.”

A thermometer monitors skin temperature, which can provide insights into how your environment is affecting your sleep while also flagging possible illnesses. Those temperature measurements also provide more insight into women‘s health monitoring, including menstrual cycles, “improved period predictions,” and past ovulation estimates. However, Garmin says the Index is “not a medical device and is not intended for use in the diagnosis or monitoring of any medical condition.” The company also says it should not be used as a conception or birth control tool.

Other health-related metrics that are monitored and made available through the Garmin Connect mobile app include estimates on stress levels based on sleep patterns, a Body Battery measurement letting you know if you’re low on energy and need more rest. Heart rate variability (HRV), which is a measure of the varying times between heartbeats, can also be used to assess if your body is dealing with increased stress or fatigue helping you know if you need to address issues with your sleep.

These are all metrics that can be measured using Garmin’s other smart wearables and many smartwatches, but only if you’re wearing them every single night. For those who prefer to charge their watches at night so their battery is full every morning, the Index Sleep Monitor provides an alternative way to track sleep metrics that’s also free of distracting notifications. The Index Sleep Monitor does have vibration capabilities, but they’re instead used as part of a smart alarm feature that only tries to wake you during lighter sleep stages.