Impedance: 320

Microphone type: silicon microphone 

Microphone sensitivity: -32dB 3dB 

Speaker power:. 20mW*2

Signal-to-noise ratio: >70DB Distortion: <5%

Frequency response: 20Hz-20KHZ

Playing time: about 4 hours (earbuds) 

Earbud battery capacity: 30mAh 

Charging box battery capacity: 300 MAh (All technical information is subject to actual performance)