CONNECTIVITY System Requirement For IOS8.0&abocve，For Android5.0&above Bluetooth Version v5.0 DISPLAY Display Technology TFT 450 NITS Size 1.69’’ HD Display Resolution 240*280px Customisable watch faces Yes Cloud-based watch faces Yes SENSORS Optical Heart Rate Yes Accelerometer Sensor Yes SpO2 Sensor Yes PHYSICAL SPECIFICTIONS Dimension 260*37*9 mm mm mm (Total length + case diameter + Metal Frame thickness) Watch Case Material Zinc Alloy/Plastics Net Weight 40g Strap Size & Material 22mm & Liquid Silicone Water Resistance Rating IP67 BATTERY & CHARGING Typical Usage Time 7 Days On Normal Usage Without BT Calling Standby Time Up to 30 days Charging Time Up to 2 hours Charging Cable Yes HEALTH MONITORING FEATURE SpO2 Yes Step Tracker Yes Calories Burned Yes Distance Travelled Yes Activity History Yes Sleep Monitor (with REM) Yes Breathe Yes Sports Mode Yes SMART FEATURES Reply & Make BT Calls Yes Call and SMS Quick Reply (Android only) Yes Find my phone feature Yes Remote music control Yes Weather forecast Yes Stopwatch Yes Calendar Reminder Yes Timer Yes Alarm Yes Wake gesture Yes Vibration alert Yes Do not disturb mode Yes Screen brightness Yes