Get the most comfortable sleep you've ever tracked with the Garmin Index Sleep Monitor! This lightweight smart band monitors your sleep while maximizing comfort, giving you a comprehensive view of your fitness and recovery. The Index Sleep Monitor tracks your sleep stages, sleep score, HRV status and breathing variations to help you wake up feeling refreshed. For women's health, it monitors skin temperature to estimate past ovulation. The smart wake alarm gently vibrates to help you rise at the optimal time. Featuring up to seven nights of battery life, the Garmin Index Sleep Monitor gives you a complete view of your fitness and recovery! Key Features: Sleep Tracking: Provides insight with sleep score, sleep stages, HRV status and more, so you can better understand how well you recovered. Comfortable Design: Comes in two sizes, allowing you to get the data you need without compromising comfort. Seamless Data Syncing: Syncs your data with the Garmin Connect� smartphone app for more insight into your health and fitness. Breathing Variations: Uses Pulse Ox to help you better understand shifts in your breathing patterns as you sleep. Sleep Data Integration: Provides sleep data for a more complete picture of your training metrics, including training readiness, recovery time and more. Women's Health: Uses skin temperature to receive more insight into your menstrual cycle, including better predictions and past ovulation estimates. Smart Wake Alarm: Gently vibrates to wake you at the optimal time. Body Battery� Energy Monitoring: See your energy levels so you'll know when your body is charged or needs more rest. Machine Washable: Remove the module and toss the band into the washing machine.