Reference CMRDAC000040 Micro-headset to YAESU VX1/2/3; FT60 Features: Speaker: - Diameter: 15 mm. - Output Level: 72dB - Power input: 100 mW - Max. Entry: 200 mW - Impedance: 32 Ohms. Microphone: - Type: Condenser - Sensitivity: -58 dB - Impedance: 2 K ohms