JIANGMEI 2.4GHz Wireless Headphone

Multi-purpose Headphones: Fits for making office business conference calls, call center phone calls, online courses, language learning, playing games, listening to music, etc. Noise Reduction Microphone: External 180° rotary microphone with ENC noise reduction technology reduces environmental sound, enhances human voice, ideal for clear conversation. Ergonomic Design: Lightweight design, adjustable headband length, soft ear pad provide maximum wearing comfort, suitable for different head size wearing. Long Battery Life: Built-in reable 300mAh lithium battery, 2 hours charging, can provide 20-40 hours of listening time. Comes with charging base, convenient and quick charging. Specifications: Frequency Range: 2.402GHz-2.480GHz Operation Range: 10 meters Frequency Response: 20-20KHz Sensitivity: 108±3dB Impedance: 40mm, 32Ω, 20mW Mic Frequency Response: 10-28000Hz Mic Sensitivity: -40~-45dB Mic Impedance: 2.3KΩ Battery Capacity: 3.7V 300mAh Working Time: 20-40 hours Standby Time: about 100 hours Charging Time: 1-2 hours Color: Black Item Size: approx. 17.2*17.0*6.7cm/6.77*6.69*2.63in Item Weight: 92g/3.24oz Charging Base Size: 7.8*7.3*3.0cm/3.07*2.87*1.18in Charging Base Weight: 69g/2.43oz Package Size: 17.6*14.7*6.9cm/6.93*5.78*2.71in Package Weight: 250g/8.82oz Package List: 1 * On-Ear Headset 1 * USB Receiver 1 * Charging Base 1 * Charging Cable 1 * User Manual (English)