New Bluetooth 5.0, pau1603 Bluetooth solutionBluetooth effective distance >10mThe maximum power of earphone is 10MWAudio signal to noise ratio: S / N > 90dBFrequency response: 50 Hz - 20 kHzSpeaker unit: 13mm, 26r high fidelity NdFeBBilt in battery: lithium battery: headset: 3.7v/30mah, charging stand: 3.7v/500mahMusic time: about 4 hours (80% volume)Tak time: about 4 hours (80% volume)Charging input standard: type-C, DC5V, 500mACharging time: earphone: about 1.5 hours     Carging box: about 2.5 hoursThe capacity of the battery after 300 charge discharge cycles is 80% of the initial capacityTrack system: stereo