Understand stress with all-day body response tracking. Identify patterns of stress with all-day body response tracking and smart notifications to remind you to reflect on your emotions. Try new ways of managing stress with guided breathing, exercise, meditations and more. Sleep Profile and Sleep Score give insights for better sleep. Sleep Profile9 breaks down your sleep data each month and pinpoints how you can improve sleep based on 10 key sleep metrics. Check your Sleep Score to learn about the quality of your previous night's sleep, and get a breakdown of time in light, deep, and REM sleep with Fitbit Premium.2 Focus on your heart with the ECG app and heart rate tracking. Use the ECG app for on-demand atrial fibrillation assessment or turn on irregular heart rhythm notifications to assess your heart rhythm while you're still or sleeping.3 Heart rate tracking surfaces insights from your sleep, stress, activity, and more while high and low heart rate notifications keep a close eye on your heart. Get more out of your workouts. Your Daily Readiness Score analyzes recent activity, sleep, and heart rate variability. Maybe you’re signed up for a HIIT class but change plans after seeing your score – Fitbit Premium serves up a yoga flow for you.2 Help from Google Maps and Google Wallet. Reach your destinations easier with turn-by-turn directions from Google Maps.5 Make speedy, secure checkouts from your wrist with Google Wallet.4 Battery: - Battery Technology: Lithium Polymer (LiPo) Design: - Band colour: Black - Band size: S/L - Closure type: Single prong strap buckle - Market positioning: Smartwatch - Maximum strap length: 20.9 - Minimum strap length: 12.9 - Product colour: Black - Protection features: Water resistant - Shape: Square - Suggested gender: Unisex - Watch case colour: Black - Watch case material: Aluminium - Waterproof: Yes - Waterproof up to: 50 - Wrist size range: 129 - 209 Display: - Always-on display: Yes - Colour display: Yes - Display type: Digital - Touchscreen: Yes - Watch glass type: Corning Gorilla Glass 3 Features: - Accelerometer: Yes - Activity tracker: Yes - Advanced workouts: Yes - Alarm clock: Yes - Altimeter: Yes - Ambient light sensor: Yes - Answerphone remote access: Yes - Automatic daily activity detection: Yes - Blood oxygen sensor: Yes - Blood pressure monitor: Yes - Call notifications: Yes - Calories burned: Yes - Distance travelled: Yes - Find my phone function: Yes - Heart rate monitor: Yes - Heart rate sensor type: Optical - Quality of sleep: Yes - Short Message Service (SMS): Yes - Skin temperature sensor: Yes - Smart notifications: Yes - SMS notifications: Yes - Thermometer: Yes - Vibrating alarm clock: Yes - Vibrating motor: Yes - Virtual assistant: Amazon Alexa - Workout tracking: Yes Network: - GLONASS: Yes - GPS (satellite): Yes - Mobile network connection: No Operational conditions: - Operating temperature (T-T): -10 - 45 Packaging content: - Charger: Yes - Charging base: Yes Performance: - Built-in camera: No - Built-in microphone: Yes - Built-in speaker(s): Yes - FM radio: No - Mobile operating systems supported: Android/iOS - Operating system installed: Fitbit OS Ports & interfaces: - Bluetooth: Yes - Bluetooth Low Energy (BLE): Yes - Bluetooth version: 5.0 - Headphone connectivity: Bluetooth - Near Field Communication (NFC): Yes - USB port: No - Wi-Fi: No Power: - Battery life: 144 - Battery life: 6 - Battery life (GPS mode): 5 - Battery life (max): 144 - Charging time: 2 Vendor information: - Brand Name: Fitbit - Warranty: 1 Weight & dimensions: - Thickness: 6.6 - Product.Details.Specifications.Level1: Consumer Electronics - Product.Details.Specifications.Level2: Smart Devices - Product.Details.Specifications.Level3: Wearables & Accessories - Product.Details.Specifications.Level4: Smartwatches