describe Main control (CPU) BT8959T5 Memory (RAM+ROM) 128Mb FLASH Screen display LCD 1.83 "TFT resolution: 240 * 284 Display brightness (assembly brightness) 500 lumens Touch panel OGS structure Material: PC+ABS shell+silicone strap. Bluetooth Version Bluetooth 5.3 Battery capacity polymer lithium battery 250mAh with battery protection IC 30 days of standby time Working Time: Approximately 5 days Charging time 3H Gravity Sensor (G Sensor) Silicon Chuang STK8321 Heart Rate Sensor HX3918 Vibration 0820 Motor Charging cable magnetic suction cable charging with patch protection IC Speaker 1508 (waterproof speaker) Mic TMG4015 (waterproof microphone) Waterproof Level IP68 Charging Requirements for Charging 1A or Below APP Fitcloudpro Bluetooth calling Heart rate detection Blood oxygen detection Blood pressure monitoring Time display, step count, calories, distance, heart rate Multiple sports modes Sleep monitoring (sleep time, sleep quality) Call notifications, message reminders, and push notifications in multiple languages Task reminder (sedentary reminder) Music control Synchronize data to APK/APP App/APK download method (App Download) Android and Apple app synchronization: Fitcloudpro Reminder: (IOS system is available in the Apple Store, Android phones can search for Fitcloudpro in the App Store to download and install) Scan QR code to download and install Fitcloudpro The system requires Android 5.0 and above, IOS 10.0 or above, supports Bluetooth 5.0