Highlights EDA detection and stress management Heart rhythm assessment with ECG app* High and low heart rate notifications On-wrist skin temperature sensor Google Assistant and Amazon Alexa Built-in** Built-in mic and speaker to take Bluetooth calls hands-free*** Understand your SpO2 (blood oxygen) levels Built-in GPS 6+ day battery life, varies with use and other factors *Fitbit ECG app is only available in select countries.Not intended for use by people under 22 years old. **Voice assistant availability and features may vary. ***Available when phone is nearby. Requires more frequent charging. Description Meet Fitbit Sense--the advanced health smartwatch that helps you tune into your body and guides you toward better health. Assess your heart for atrial fibrillation (Afib) right from your wrist, detect and manage stress, better understand your sleep quality and even keep an eye on patterns in your skin temperature or well-being with SpO2. Plus, Sense unlocks a 6-month free trial of personalized guidance and advanced insights for new Fitbit Premium users.* *New premium users only. Must activate with device. Valid payment method required. Free trial must be activated within 60 days of device activation. Cancel before free trial ends to avoid subscription fees. Specifications Features: Black (band) Weight: .07 Pounds Placement: Wrist Water Resistance: Water-Resistant Product Model: Fitbit Sense Battery Charge Life: Up to 6 Days Electronics Features: Water-Resistant, Calendar Notifications, Changeable Bands, Voice Control, Built-In GPS, Music Capabilities, Accelerometer, Alarm Notifications, Reminders to Move, Route Tracking, App Notifications, Makes and Receives Calls and Texts When Paired with Compatible Device, Text Notifications, Touchscreen Display, Call Notifications Material: Watch Band: Silicone Includes: Instructions, Charging Cable, Wristbands Operating System Compatibility: Apple iOS, Android Connection Types: USB Wireless Technology: Bluetooth, near field communication, Wi-Fi Screen Size: 1.58 Inches Activities tracked: Yoga, Multi-Sport Modes, Hiking, Dynamic Workout Activities, Tennis, Running, Pilates, Elliptical Training, Swimming, Martial Arts, Golf, Weights, Cycling, Walking Metrics Measured: Sleep Quality, Heart Rate, Calories Burned, VO2 Max, Floors Climbed, Stress Level, Active Minutes, Sleep Duration, Daily Distance, Trip Time, Heart Rhythm (ECG), Sleep Interruptions, Total Steps, Menstruation, Blood Oxygen Level (SpO2), Trip Distance, Sleep Stages Material: Stainless Steel, Aluminum Alloy Battery: 1 Lithium Ion, Required, Included