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Name: RIVERSONG AirX Blurtooth Earphone Style: In ear Driver Unit: Φ6mm Frequency Responses: 20 Hz~ 20K Hz Impedance: 32Ω± 15% at 1kHz Sensitivity: 93± 3dB at 1kHz 1mW Distortion THD: 1.5% at 1kHz 1mW Maximum Input Power: 0.01W Battery Type: Lithium Polymer Battery,3.7V,60mAH Bluetooth Version:V4.1 Receiving Range: 10 meters without obstacle Working Voltage: 3.7V Charging Method: Micro USB charging plug Charging Time: 1.5 hours Standby Time: 120 hoursWorking Time: 3 hoursTwo Bluetooth Connection :connect with 2 cell phones or tablets at the same time.You will not miss any important calls.Phone above thestatus bar displays the electricity consumption of Bluetooth for iPhone users. Great superior surround sound and deep bassNoise Cancellation Technology: Wiress Bluetooth Headset CVC noise cancellation technology reduces outside