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Specification: Bluetooth Version:Bluetooth 4.1+EDR Working Voltage:DC 3.7V Working Current:14 mA Battery Content:180 mAh Run Time:Up to 10 hours Transmission Range:>33 FT Jack Type:Universal 3.5 mm Product Dimension:1.7inch(R) x 0.47inch(H) Color:Black Features: -Support hands free,can connect microphone and support phone calling through Bluetooth receiver. -Compatible with home/car stereo,speakers,headphones,pair two devices with one,enjoy music and won't miss the call. -Automatically connect to the device which paired before,and double click the multifunctional button to make a redial to the final call. -Use A2DP technology to stream high quality sound,Audio signal to noise ratio ≥91.9dB,Distortion ≤0.1%. Package include: 1 x Portable Bluetooth Receiver 1 x USB Cable 1 x 3.5 mm Audio Cable 1 x 3.5 mm Male to Male Connector 1 x User Manual