Rapoo 2.4GHz Wireless Headset Headphone with Microphone - Silver + Black
Color: Silver + Black - 2.4GHz wireless technology - Frequency: 20Hz~20KHz - SNR: 84dB - Voltage: 3.7V/60mA - With microphone - Built-in 300mAh lithium battery - Charging time: 2 hours - Working time: 6 hours - Specification of microphone: - Frequency response: 100Hz~8KHz - Sensitivity: -46±3db - SNR: >=50dB - Comes with USB receiver - Modulation system: GFSK - Operating range: 10 meters