Band Dimensions (mm): Φ49.5 × 13.4 mm Color: Black Key Features: Exclusive optical scroll wheel—controls secondary and tertiary menus, watch faces, and volume; switches music tracks; adjusts flashlight intensity; regulates screen brightness; and facilitates menu navigation, zooming, and rotation. 1.43-inch AMOLED display (466 × 466 pixels); Compass; High-intensity flashlight; Full-screen touch interface; CCC certification; Stress monitoring; Exercise and activity tracking (steps, distance, calories); Sports modes; Voice assistant; Message notifications; Information storage; Sleep monitoring; Weather updates; Alarm clock; Timer; Stopwatch; Calculator; Stress relief and sleep aid; World clock; Remote camera control; Music control; "Find My Phone" function; Women's health tracking; Hydration reminders; Always-On Display (Clock); Password lock; Dialing and calling functions, etc. Compatible System: Android 6.0+ (inclusive) and iOS 10.0+ (inclusive) FLASH Memory: ROM 128MB Display Type: AMOLED Screen Size: 1.43 inches Resolution: 466 x 466 Pixels Encoder: Optical Encoder HX3508L Touch Type: Full-screen touch Bluetooth: BT 5.4 Low-Power Chip Wi-Fi: Not supported NFC: Not supported G-Sensor (Gravity Sensor): STMicroelectronics LIS2DOCTR Gyroscope: Not supported Heart Rate Sensor: HX3918 GPS: Not supported Battery Type: Polymer Lithium-ion Capacity: 1100mAh Charging Method: Magnetic charging Da Fit App Features: Step count, sleep tracking, heart rate, blood oxygen, blood pressure, stress monitoring, sports data recording, hydration reminders, etc. Watch Face Selection, Message Notifications, Daily Alarms, Camera Remote Control, Weather Information Find Device, Time Format Settings, Do Not Disturb (DND) Schedule, Raise-to-Wake Waterproof Level: IPX8 / 3ATM (Water-resistant up to 30 meters) Charging Time: Approx. 4 hours Battery Life: Approx. 25–35 days (typical use); Approx. 200 days (standby) Product Language English, Simplified Chinese, Japanese, German, French, Spanish, Russian, Traditional Chinese, Italian, Portuguese, Dutch, Indonesian, Thai Bluetooth-Connected Watch Product Languages English, Simplified Chinese, Japanese, Korean, German, French, Spanish, Arabic, Russian, Traditional Chinese, Ukrainian, Italian, Portuguese, Dutch, Polish, Swedish, Finnish, Danish, Norwegian, Hungarian, Czech, Bulgarian, Romanian, Slovak, Latvian, Indonesian, Thai, Turkish, Vietnamese, Hindi, Pashto, Lithuanian, Estonian, Slovenian, Croatian, Greek, Filipino, Hebrew, Malay, Serbian, Persian Wristband Size: Total length approx. 275 mm; adjustable length approx. 155–235 mm Materials: Body: Zinc alloy vacuum-plated front casing + eco-friendly plastic back casing + metal buttons Wristband: Silicone Packaging Box Dimensions (L*W*H): 165 × 96 × 25 mm