Product No.：BH520Bluetooth version：CSR8615-V4.0 CLASS2Frequency range：2.4GHz-2.480 GHzTransmission distance：10M (The transmission distance differs with environment factors and the Bluetooth device of mobile phone)Work hours：12 hoursStandby time：250 hoursSupport agreement：HFPV1.6，HSPV1.2，A2DPV1.2，AVRCPV1.4Charging interface：MicroUSBBattery Specification： Rechargeable lithium battery（3.7V ,180mAH）Charging power supply：5VDC,100-240V AC adapterPower rating：3MWSound track：Single trackNoise-signal ratio S/N：≥30DBFrequency range：20Hz-20KHzDistortion factor THD：≤1%
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