Crown Micro Black Stereo Bluetooth Headset EAN:6941141600305 Brand: CROWN Bluetooth 5.0+EDR Control panel with integrated microphone on the cable 3 pairs of ear pads included Clip for convenient attachment Battery Capacity: 55mAh Charging time: 2 hours Charging input: micro USB Range of action: up to 10 meters Magnetic holder in the case Microphone Sensitivity: -58±3dB Speaker diameter: 10mm  Speaker Sensitivity: 90±3dB Impedance: 32 ohms Frequency range: 20-20000Hz