We are factory and focus on quality. Brand is SoundTOP. Use bettery battery so It can last 4-6 hours if listen music. It also can answer call｣ｬ It vibrate when a call come. <br /><br />Kind Tips:<br />1. Someone sell headsets which is not anti-wear recently. The surface of this type seems darkeness and easy to be scratched. our headsets are anti-wear｣ｬ very bright surface. you can clean it easily if some dirty.<br /><br />2. Others lower price and lower quality. we lower price but same good quality..We are factory outlet｣ｬ always use good material. We<br />do long time business｣ｬ not just once off.<br /><br />Specification: <br />1. Changing voltage: MICRO USB 5V<br />2. Working current: 25-30 mA<br />3. Output power: 2x20mW <br />4. Blue tooth working range: 5-10M<br />5. Frequency range: 2.401-2.480GHz<br />6. Frequency response:20HZ-20KHZ <br />7. SNR : S/N｡ﾝ95 <br />8. Distortion factor: ｡ﾜ 1% <br />9. Bluetooth Version: 3.0+EDR <br />10. Type:Stereo <br />11. Dimension: 167.3*135.6*16.9mm(L*W*T) <br />12. Support volume adjusting: long press the Volume &quot; + or -&quot; key.<br />13. Support to change the song: short press the Volume &quot; + or -&quot; key.<br />14. Compatible with cellphones such as iPhone｣ｬ Nokia｣ｬ HTC ｣ｬSansung｣ｬLG｣ｬ Moto｣ｬ PC｣ｬ iPad｣ｬ PSP and so on enabled bluetooth.<br />15｣ｬ Without retail box. <br /><br /><br />Package Includes :<br />1 X Wireless Bluetooth HandFree Sport Stereo Headset headphone (no retail box)<br />1 X Micro US