Overview: This smart watch is simple and elegant, supports SIM card, 4G LTE network, WiFi, BT 5.0 wireless connection and 2.88 inch touch screen, a variety of sports functions, supports heart rate monitoring, suitable for men and women. Features: MT6761 quad-core CPU, with Android 11.0 system, 4GB RAM and 64GB ROM. Support Nano SIM card, 4G LTE network, WiFi, BT 5.0 wireless connection, 2.88 inch round touch screen, bring you a smart phone-like smart experience. The watch supports multiple sports modes. Generate trajectory maps and professional data analysis to allow you to better manage health activities and provide GPS positioning. Built-in professional heart rate detection sensor, supports heart rate monitoring and generates data display. Comes with an application store and supports APP download. Built-in 2 million cameras, 8 million cameras It supports the manual selection of language on the watch, answering and making calls, phonebook, sending SMS, downloading third-party app, video call, photo taking, alarm clock, calendar, calculator, recording, local music playing, weather, voice search, step counting, heart rate, multi exercise mode, looking for mobile phone, stopwatch, music control, holding up the hand to light the screen, changing the dial, pushing messages, etc Specification: Mobile phone type: 4G Android Main screen size: 2.88 inche Model: JingTider New Upgrade S999 Main screen resolution: 480 x 640 Network type: Single SIM card Network mode: GSM/WCDMA/TDS-CDMA/LTE Supported frequency bands: 2G (2/3/5/8) and 3G (1/2/4/5) and 3G (TD-SCDMA (B34/39) and 4G FDD (B1/2/3/4/5/7/8/12/17/20/28AB/B66) and 4G TDD (B38/39/40/41)) Key type: Virtual QWERTY keyboard and 2 side keys Body color: Black, Silver Mobile phone size: 77.3 x 53.1 x 15mm Operating system: Based on Android OS v11 CPU model: MTK6761 Quad Core Ram:4GB Rom:64GB SIM card type: SIM card (small card iPhone5S card) Battery type: Built-in battery Battery capacity: 2300mAh Call history: Received calls and Dialed calls and Missed calls Address book: business card-style storage Text messaging (SMS), recording function, alarm clock function, timer, stopwatch, calendar function, WIFI, Bluetooth, camera and video recording, music and video playback, GPS navigation GPS Navigation: Built-in GPS, supports A-GPS Map software: Supports Google Maps, Baidu Maps, and Sogou Maps (user-defined installation) Sensor types: step counter sensor, gravity sensor, gyroscope Camera: Built-in mini camera Camera pixel: HD 2 million and 8 million Sensor type: CMOS Video playback: Supports formats such as mp4/3GP/rmvb/flv (download and install a player from the Android Market) Audio playback: Supports formats such as mp3/acc/amr/ogg/m4a/mid/wma/flac/ape/aac/wav Image format: Supports JPEG, PNG, GIF, BMP, and other formats Application features: User-defined installation E-book: (user-defined) Bluetooth transmission: Bluetooth 5.0 WLAN function: WIFI Browser: Supports WAP 2.0 browser Data interface: 4-pin magnetic charging, supports USB function