BTS2.0U Plus   Portable Speaker(BPS2.0)   ．USB Power type Sound-bar design ．Special Tuned Full-Range 30mm Drive Unit ．Stereo Expander (Virtual 3D) ．Bass Booster (Optional)   Extreme Batt. Power Design ．Class-D Amp. ．0.79mA Quiescent Current ．>60% lower power consumption than other 　 D-Class Amp. ．Wild-Range Operation Voltage: 2.5V ~ 5.5V Dual Power Input Design ．AAA x 4 Battery Cabin ．5V DC input for AC Adapter or USB input       2.1 Bar Type Speaker (BTS2.1U Plus)   RF 2600 Wireless Headset   ．12W Flat & Base type Sound-bar design ．Integrated Dual Sub-woofer Unit ．Powerful Audio Solution- 3D surround 　 sound. ．2W+1W Speaker Unit (each channel) 　 design. ．Front panel audio out jack   ．Simple plug & play--USB wireless transmitter 　 without software or pairing installation. ．Move freely up to (20 meters) away from your 　 computer. ．Working time: 8 hrs. ．Clear sound quality for PC calling, music, and 　 games. ．2 AAA batteries power supply. ．Rotate-to-mute: The microphone utomatically 　 mutes when you rotate it up and out of the 　 way.