Ovtech Bone Conduction Headset Microphone Bluetooth Stereo Headset White and Black

BT3.0+EDR wireless Bluetooth Stereo Headphone sports Headset with NFC function Specification Mic Specification Microphone Unit: Φ4*1.5mm Directivity: Omni-directional S.P.L: -42±3dB S.P.L at 1KHz Impedance: ≤2.2kΩ Frequency response: 20Hz-20KHz Operating voltage: 1.5V-10V Speaker Specification Speaker diameter: Φ10mm Impedance: 32Ω S.P.L: 98±3dB S.P.L at 1KHz Rated power: 1mW Aggregate capability: 3mW Frequency response: 20Hz-20,0000Hz Specification Bluetooth version 3.0+EDR