Rated power : 3mW Frequency response : 0~20 (kHz) Directivity : Unidirectional Sensitivity 97±3 (dB/W) S/N ratio : 97±3 (dB) Harmonic distortion : <5% (TMD%) Model Number: 8mm Earphone Speaker Unit TWS Bluetooth Speaker Size: as pictured Package included:2pcs Earphone Speaker