<p><b>Attention pls: This TV headphones Set includes a digital optical to analog adapter. </b></p><p><b>The headphone batteires have been installed before the shipping. </b></p><p> <b>When you get these you initially need to put them on the charger and let them charge for about seven hours. There is a green charging indicator light that goes off when they are fully charged. Thanks!</b></p><p>​</p><p>​ </p><p>ARTISTE not only has a number of technology patents, but also master the world advanced headset design and production experience. </p><p>It is committed to provide users with real, shock of audio-visual feeling! </p><p> ADH300 is long-distance high fidelity music headsets with meticulous overall voice . </p><p>Its Voice is clear and at the same time also ensures good dynamic, able to adapt to a variety of types of music , and meet the demand of daily video use. </p><p> ADH300 is your household's good choice that you can enjoy the real sound. </p><p> </p><p> <b>Product Parameter:</b> </p><p>Working Voltage:Transmitter/charger DC 5V 550mA </p><p>Receiver:2*1.2V AAA </p><p> Frequency Response:25Hz-20KHz </p><p> Carrier frequency :2.4GHz </p><p>Modulation Modes:GFSK </p><p>Degree of Distortion:<0.5% </p><p>SNR>70dB </p><p>Effective distance:30 meters </p><p> </p><p> <b>packing list:</b> </p><p> Wireless headphone *1 </p><p>transmitter*1 </p><p>RCA-3.5MM *1 </p><p>Rechargeable battery: one pair </p><p>3.5MM-6.3MMrotary union </p><p>Power Adapter*1 </p><p>Specification*1 </p><p> Warranty Card*1</p><p>Optical Adapter*1</p>