4G TDD-LTE: B38,B39,B40,B41. 4G FDD-LTE : B1,B3,B5,B7,B8,B20. Bluetooth: 5.3 BLE. Watch strap: Silicone strap. Vibration motor: 0720 circular motor. Microphone: silicon microphone FPC. Speaker: 1306 0.8W.
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