RKSTN Smart Watch (Call Receive/Dial), 1.8 Inch HD Full Touching Screen Smartwatch Fitness Watch With Call/Text/Heart Rate Product parameters: Chip maker:Goodix+Jieli Chip:GR5515+AC6963A APP:Da Fit Compatible system:Android4.4 (contain), IOS8.0 （contain) above FLASH memory:RAM256KB ROM64Mb Type:TFT Screen size:1.8 Inch Pixels:240RGBx286 Touching type:Full screen touching BT:5.1 Bluetooth Low Energy Chip WIFI:NO NFC:NO G-Sensor:YES Gyroscope:NO Heart rate:Tianyi Hexin 3605 GPS:NO Battery type:Lithium polymer Capacity:260mAh Charging mode:Magnetic APP Software Features: APP name:Da Fit Step count, sleep, heart rate, blood pressure, oxygen saturation, exercise data record Dial selection, message push, daily alarm clock, photo control, weather information Find bracelet, time format, do not disturb mode time, all-day heart rate test, turn the wrist bright screen Supports languages: Danish, Ukrainian, Russian, Bulgarian, Bokmal, Norwegian, Hindi, Indonesian, German, Italian, Czech, Japanese, French, Polish, Thai, Swedish, Simplified Chinese, Traditional Chinese, Finnish, English, Portuguese, Spanish, Vietnamese, Arabic, Korean Waterproof Level:IP67 Charging time:About 2.5H Life time:2-3 days of use, 7 days of standby Product language:English, Chinese, Japanese, Korean, German, French, Spanish, Arabic, Russian, Traditional, Ukrainian, Italian, Portuguese Wristband size:Total length 25.5CM/10.04 inch, Adjust length 15.5-23.5CM/6.1-9.25 inch Bracelet size:4.64x3.79x1.18cm/1.82x1.49x0.46 inch Package size:16.5x7x3cm/6.49x2.75x1.18 inch Net weight:57g/0.12 LB Gross weight:144g/0.31 LB The Package Include: 1 x Smart watch 1 x Use manual 1 x Charge cable