Display Screen: 1.95 inches HD Spherical Screen Type: IPS, 490x490 resolution Metal watch case Performance Main Chip: SC8541E, fifth-generation high-speed running chips RAM: 3GB ROM: 32GB Connectivity 4G Full Netcom:  2G: B2, B3, B8, B5 3G: B1, B2, B5, B8 4G FDD: B1, B2, B3, B4, B5, B7, B8, B12, B17, B20, B28, B66 4G TDD: B34, B38, B39, B40, B41 Bluetooth: Supported WiFi: Built-in with LDS antenna GPS: Real-time positioning with GNSS module supporting GPS, Beidou, GLONASS, QZSS, AGPS, G-Sensor, Wi-Fi, and base station positioning Health Monitoring Sensors: Blood pressure, heart rate, and blood oxygen monitoring Navigation Built-in 3D Stereoscopic Navigation: Satellite precise positioning for real-time trajectory tracking Camera Side HD Camera: 200W single side camera (GC2385), supports HD video calls, taking pictures, and scanning codes Storage and Expansion Memory: Super large memory allowing extensive app downloads SIM Slot: Cato type, nano card No TF Card Slot Additional Features Battery: 1100mAh with protection board Seiko 3.0V protection Loudspeaker: 1508 welded wire type Microphone: 4015 wire solder type Charging Port: Pogo PIN, 4 pin NFC: Supported, can write to normal access control How to Connect the VWAR CORE4/CORE3 to Your Phone for Message Syncing: Update Firmware: Go to the settings menu on your VWAR CORE4 and update to the latest firmware. Download the "Bletoots" App: Visit the APP Market on your smartwatch and download the "Bletoots" app. Download the HisportPro App: Install the HisportPro app from either the App Store or Google Play Store on your smartphone. Bind the Device: Open the "Bletoots" app on your VWAR CORE4 and scan the QR code within the app to bind the device to your phone. (The HisportPro app may experience some initial issues (such as not receiving notifications). Our engineers are actively working on continuous optimizations and updates to improve performance.) ☀NFC door access ( It doesn't supports NFC payment ) : The watch has a built-in NFC chip, there is no NFC software icon on the watch, you only need to use the watch as an NFC access control card, record the NFC ID of the watch through the access control system, and then the watch can be used as an NFC access control card.(1). The NFC of this watch only supports as IC door cards with a frequency of 13.56MNZ (applicable to 80% on the market), does not support other functions.(2). The fingerprint lock enters the administrator mode-add-card-write.(3). Encrypted access control of the community needs to be written in the community property management office.