Specification of bluetooth Bluetooth version: V3.0+EDR distance: 10m Range of frequency: 2.4-2.4835GHz TF card supported: 128M-32G FM frequency response: 87.5-108MHz Specification of headphone Speaker: ¢40mm Sensitivity: 115dB S.P.L at 1KHz Impedance: 32ohm Frequency response: 20Hz-20KHz Rated power: 40mW Cable length: 1.5m Microphone Unit: 4.5mm×2mm -58dB±3dB Plug type: ¢3.5mm stereo Rechargeable lithium battery: 550mAh Charging time: less than 3 hours Normal volume playing time: 10h Standby time: 180h
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