Speaker specs: Unit: 50mm. Freq: 20-20,000 hz Impedance: 32 + - 15 % Sensitivity: 116 db. + - 2 db. Max input.: 100mw. Mic specs.: Type: Concentrator Unit: 6x5mm. Freq: 50-1,600 hz Impedance: 2.2 k. Sensitivity: - 38 db. + - 2 db.