Haylou TWS GT1 Pro Bluetooth Earphone Specifications: Main Features:Frequency Range: 20-20,000HzImpedance: 32ΩSound Level/Sensitivity: 110 dBPower Output: Built-in batteryBattery:Battery Capacity:Earphone: 43mAhCharging Case: 800mAhConnection Type: WirelessDuration:Charging Time: 1.5 hoursMusic Time: 3.5 hoursStandby Time: 300 hoursPhysical Specifications:Connector: BluetoothWeight: 35gWarranty: 3 MonthsThe Haylou TWS GT1 Pro combines robust sound performance with a substantial battery life, making it ideal for extended listening sessions on the go.