Features: 1. Heart rate monitoring, blood pressure monitoring, sleep monitoring, sedentary reminder, always pay attention to your health, and give yourself and your family a health guarantee. 2. Support female physiological period function reminder, even if the work is too busy, you are not afraid to compatible withget. 3. Pedometer,Step Traker, distance , calories, stopwatch , countdown, call reminder ( caller number/name ), message reminder, alarm reminder, anti-lost reminder, sedentary reminder, remote control photo, lift wrist bright screen , etc., Make your life easier. No GPS module, support GPS track query. 4. IP68 deep waterproof , no fear of sweat, rain. It makes you feel at ease when you do exercise. 5. Support multi-language, Bluetooth 4.0 Description: Product model: F21 App operating system: compatible with IOS8.0 or above,compatible with Android4.4 or higher Gsencor sensor: KXTJ3-1057 Master: nRF 52832 Heart rate sensor: Yiguang PD70-01C-TR7 Vibration reminder: motor vibration reminder Waterproof rating: IP68 Display: 1.14" 135*240 resolution TFT Bluetooth: BLE 4.0 Strap material: silicone strap Host size: about 47*24*13mm/1.85*0.94*0.51inch Machine size: about 260*24*13mm/10.24*0.94*0.51inch Operation: single touch, lift the wrist screen will bright. Battery: polymer lithium ion battery Battery capacity: 100 mAh Standby time: 7-10 days Charging method: magnetic charging cable Charging time: about 2 hours Supported languages: Chinese, English, German, Russian, Japanese, French, Korean, Portuguese, Spanish, Italian, Persian, Vietnamese. Packing list: 1* smart bracelet 1* charging cable 1* instruction manual