Display: TFT, 240 x 284 pxSpeaker: Speaker Sensitivity: 93dB (3dB)Speaker impedance: 815%Speaker frequency response: 100Hz 20KHzSpeaker power: 1WCommunication: Bluetooth 5.3 + BR/EDRMaterial: Case: Metal + plastic, Band: SiliconeCharging time: About 3 hoursSystem compatibility: Android 5.0 or later, iOS 10.0 or laterApplication: Mibro FitStrap length: 254mm