Bluetooth Specification : V4.0+EDR class 2RF
<br />Frequency Range: 2.402-2.480GHZ,2.4G ISM brand
<br />Impedance:32 ohm
<br />Operating distance:about 10 meters
<br />Nominal charging time: Max 2 hours
<br />Micro USB Charging Port
<br />Charger adapter output: DC 5V&amp;amp;amp;amp;amp;amp;130mA
<br />4 in 1,Bluetooth Stereo Wirless Headphone