Discover the power of restorative sleep with the Garmin sleep monitor. This comfortable, lightweight band tracks essential metrics like sleep score, stages, and heart rate variability, providing the insights you need to optimize your nightly recovery, all while seamlessly syncing with your Garmin smartwatch for a comprehensive view of your health. FEATURES: Worn on the upper arm, this lightweight and breathable smart sleep band provides comfort throughout the night, Can provide sleep-tracking metrics, including sleep score, sleep stages, HRV and duration of rest (data presented is intended to be a close estimation of metrics tracked), Up to 7 nights of battery life, For more insight into your health, the breathing variations feature uses Pulse Ox to check your level of variations while sleeping (this is not a medical device and not intended for diagnosing or monitoring medical conditions; Pulse Ox is required and not available in all countries), Using skin temperature, advanced women’s health tracking provides more insight into your menstrual cycle, including better period predictions and past ovulation estimates (this feature is not intended to support conception, contraception or birth control and is not a medical device), If you don’t own a Garmin smartwatch, Index™ Sleep Monitor sleep metrics can sync directly to the Garmin Connect™ app, Smart wake alarm gently vibrates to wake you at the optimal time, Machine-washable for easy cleaning, Water-resistant depth: 5 meters. WHAT'S INCLUDED: Index™ Sleep Monitor, charging/data cable, documentation. DETAILS: 17.8"H x 2.5"W x 0.02"D (452 x 63.5 x 0.55 mm), Weight: .04 lbs., Requires one Lithium ion battery (included), Battery life: 56 hours, Battery charge time: 2 hours, 1 connection, Compatible with iPhone® and Android™, BLE (BLUETOOTH Low Energy 5.0), Wireless range: 20 feet, Manufacturer's 1-year limited warranty: For warranty information please click. Gift Givers: This item ships in its original packaging. If intended as a gift, the packaging may reveal the contents. Size: Large. Color: Black. Gender: unisex. Age Group: adult. Material: NONE.