Features: [High-Class Hardware]: Android 7.1.1 operating system, 1.39 AMOLED screen, 454*454 pixel, 2GB+16GB memory. [Dual Chipsets]: MTK6739 Quad Core + Nordic 52840, more effective and more convenient. [Dual Modes]: Smart Watch Mode+Smart Wristband Mode, it can be switched between the two modes. [4G LTE]: Built-in Nano SIM card, support 4G network and call, high speed data transmission. [8.0MP Front Camera]: High-resolution selfie, its picture is clear and bright, convenient to record your beautiful moments in life! [3 Ways Positioning]: GPS/GLONASS/Beidou positioning, help you find the direction faster and more conveniently. [Multi-Sport Modes]: Outdoor running, outdoor walking, indoor running, riding, rope skipping, football, etc. [Health Fitness]: Heart rate monitoring, steps, calories, speed and cadence monitoring. [Long Standby Time]: Standby time is up to 4 days in the wristband mode, don\'t worry about low battery. [Wide Compatibility]: Support BT 4.0, Android 7.1.1, iOS 8.0 and above. [Main Functions]: 4G Call, BT, GPS/GLONASS/Beidou, WiFi, Multi-Sports Modes, Heart Rate, etc. Parameters: CPU: MTK6739 1.25GHz, Quad Core + Nordic 52840 (Dual Chipset Technology) Screen: 1.39 AMOLED Resolution: 454*454 Pixel RAM: 2GB ROM: 16GB SIM Card: Single SIM (Nano SIM) Network: TDDB38/B39/B40/B41 FDD LTE2100(B1)/1900(B2)/1800(B3)/850(B5)/2600(B7)/900(B8)/B12/800(B20) TDS CDMAB34/B49 WCDMA850(B5)/900(B8)/1900(B2)/2100(B1) GSM850(B5)/900(B8)/1800(B3)/1900(B2) WiFi: Dual-band (2.4GHz/5GHz), single stream 802.11a/b/g/n MAC/BB/RF, 802.11d/h/k compliant GPS: GPS/GLONASS/Beidou BT: BT 4.0 Camera: 8.0MP Front Camera Mic/Speaker: Yes Operation System: for Android 7.1.1 Compatibility: with Android 7.1.1, iOS 8.0 and above Sensor: Heart-rate monitor, Proximity sensor, Accelerometer Battery Type: Polymer lithium ion battery Battery: 545mAh Standby Time: About 1 day (Smart Watch Mode), About 4 days (Smart Wristband Mode) OTA Upgrade: Yes For Google Play: Yes Language: English, Portugus(Brasil), Portugus(Portuguesa), русский, Espaol, Italiano, Franais, Polski, Bahasa Indonesian, Deutsch, Tiếng Việt, Trke, Hebrew, Arabic, Persian, Hindi, Bengali, Thai, Burmese, Korean, Japanese Functions: 4G Network (Global Bands), GPS/GLONASS/Beidou, with Google Play, Voice Search, Offline Music, WiFi, Weather, Clock Faces Notifications, Phonebook, Alarm, BT, Browser, Calendar, Camera, E-Book, MP3, MP4, Heart Rate Monitoring, Pedometer, Call Reminder, Answer Call, Dial Call, etc.