Speciication: rated input power : 20mw maximum input power. : 30mw impedance. : R 32 . L 32 SENSITIVITY. 103 ± 3dB channel balance : 3dB Phase : same phase speaker frame diameter : 50mm Magnet : NdFeB Cord length : 2400 ± 10%mm mic type : short mic mic frequency : 100-20kHz mic dimension : 6.0x5.0