Highlights: On-Wrist EDA Scan App, ECG App & Skin Temperature Sensor Built-In GPS, Spo2, 20+ Goal-Based Exercises, Swimproof 24/7 Heart Rate, Sleep Stages & Sleep Score, 6+ Day Battery Notifications & Apps, Google Assistant Includes A Free 6-Month Trial of Fitbit Premium

One small black band, one large, and one clasp Comes with one bonus large black band and clasp Up to 6-day battery life ECG to assess heart rhythm Sleep score and sleep stage tracking Fitbit Pay for cardless transactions Track oxygen saturation and skin temp while you sleep Fast charging Find my phone app Multi-path optical heart rate sensor Gyroscope, altimeter, 3-axis accelerometer, and skin sensor NFC, Wi-Fi, speaker, and microphone Large fits wrist 7.1" to 8.7" Small fits wrist 5.5" to 7.1" Shipping Info Standard - 4 to 10 business days Ship Info Warranty 1 Year Warranty through Fitbit Component country Imported Assembled country China