Features:High-Class HardwareTwo independent processors, two different operation systems, Android 7.1.1 operating system, advanced CPU MTK6739 1.25GHZ, 1.39 AMOLED screen, 2GB+16GB memory,more safer system and great screen, giving you great experience!4G LTE CallingSupportNano SIM card, 4G network,network frequency covers most countries and regions. You won't miss any messages or calls. It is a great substitute for your phone.1.39 AMOLED DisplayHigh-quality,1.39 AMOLED 454*454 screen,showing wonderful visual effect!8.0MP CameraThe side of the watch is equipped with an8.0MP camera. Its picture is clear and bright, convenient to record these beautiful moments in life.Sports ManagementDuring the exercise, it helps you record your distance, calories, heart rate and other data completely.IP67 WaterproofSupport IP67 waterproof, don't worry about splashing, light raining, sweat, etc in daily life.Lithium-ion BatteryBuilt-in 800mAh lithium battery; working time of 2-3 days, super long standby time of 7 days, charge once a week, offering a longer battery life so that makes your work and life more convenient.Removable StrapRemovable strap designenables you to replace the watchband freely.Main FunctionsIndependent 4G Call, Blood pressure, BT, GPS, WiFi, Multi-Sports Modes, etc..Parameters:CPU: MTK6739 1.25GHZScreen: 1.39 AMOLEDResolution: 454*454 PixelRAM: 2GBROM: 16GBSIM Card: Nano SIMNetwork: TDD LTEB38 (2600MHz), B39 (1900), B40 (2300), B41 (2500) FDD LTEB1 (2100), B2 (1900), B3 (1800), B5 (850), B7 (2600), B8 (900), B12 (700), B17 (700), B20 (800) TD-SCDMAB34 (2100), B39 (1900) WCDMAB1 (2100), B5 (850), B2 (1900) GSMB2 (1900), B3 (1800), B5 (850), B8 (900)WiFi: 2.4GHz/5GHz 802.11 a/b/g/nBT: BT 4.0GPS: GPS/GLONASSCamera: 8.0MP (5.0MP software update)Operation System: for Android 7.1.1Compatibility: with Android 5.1 / iOS 9.0 and aboveBattery: 800mAhBattery Type: Polymer batteryStandby Time: 5-7 daysAudio File Format: Mp3, wma, flacVideo File Format: Mp4, rmvb, rmPicture Format: Jpg, png, gifData Transmission: Pogo pinLanguage: Chinese, English, German, French, Spanish, Portuguese, Italian, Russian, Hindi, Arabic, Ukrainian, Czech, Danish, Hungarian, Dutch, Norwegian, Polish, Romanian, Turkish, Greek, Kazak, Serbian, Persian, Korean, Japanese, Indonesia, Malaysia, Philippines, Vietnam, Bangladesh, Thai, Laos CambodiaOther Functions: Dual system, Pedometer, Heart rate measurement, Message, Music Sync Function, Map, Weather, Alarm, for Google APP Store, Sound Recorder, Calendar, Voice Search, etc.