Shell material &amp; color Shell: Zinc alloy + vacuum plating (black, silver)<br> Bottom shell: PC+ABS+Medical grade 316 stainless steel sheet<br> Strap: TPU strap (black), leather strap (black, brown, dark brown) <br> Compatible System Android 4.4 and above，iOS 8.2 and above<br> Processor (MCU main control) RTL8762DW <br> Air pump MAC20A Micro Piezoelectric Pump <br> Accelerometer STK8321 3-axis sensor (G-SENSOR) <br> Display Tempered glass+IPS HD TFT 1.83 inches 240*280PIXEL <br> Battery capacity Pure cobalt lithium battery 240 mAh with 7-10 days of use, 30 days of standby <br> TOUCH CST816D full screen touch <br> Vibration motor Mute vibration <br> Bluetooth 5.1BLE (low power consumption) True data for sports and healty Voice broadcast data Effectively helping you understand exercise data and body condition This is not the normal watch,it use high chipest to tell you the data of your body,please don't compare with the common watch Hope it can help you for your daily life Brand E EYAFA Battery life 7 h Compatible OS Android, iOS Mobile OS Android, iOS Screen size 1.83 in Display TFT LCD Smart watch functions Message Notification, Music Control, Voice Assistant Smart watch alerts & health monitors Blood Oxygen Monitor, Calories Burned, ECG Monitor, Activity-Inactivity Alerts, Fitness Tracker, Health Tracker, Distance Traveled, Diabetic Alerts, Duration of Exercise Wireless Bluetooth 5.1BLE Case material Stainless Steel Band material Leather Color Black Watch band color Black Watch case color Black Watch case shape Square Model name E EYAFA Smart Watch 2024 Watch features Alarm, Backlight, Pedometer, Stopwatch, Timer Has touchscreen Y Voice-activated Y Alert type Vibration Watch band style sports Watch band width 22 mm Watch bezel color Black Clock / watch face color Black Has written warranty No Gender Unisex Age group Adult