EMB PKX8BT Portable Professional Rechargeable Speaker Built-in BLUETOOTH/SD/MMC/USB/Guitar Jack - MP3/WAV/WMA Playable + Wilress Microphone - BLUE Color Color BLUE. This system can be used with personal computers, mobil phone, DVD, VCD, CD, LD, TV, Mp3, Radio, Electronic Piano and any devices which have audio output. Amplifying circuits all adopt design of high performance and high fidelity and it is equipped with professional speaker of high quality to make stereo sound field acquire effect of clear positioning and distinct level. Effect of plauing of the system is outstanding, bass is surging and shocking, tenor is strong and bright, high pitch is clear and pleasing. Professional electronic frequency division circuit makes the machine have more accurate crossover point and better effect. Adopt large Capacity battery with professional design and manufacture and power capacitor specially used by speakers, make the mechanical have larger electrical source reserve, better dynamic and higher signal-to-noise ratio and be more stable. Output Power  50W / Input Sensitivity 80030mV / SNR  71dB / Frequency Response 20Hz-20kHz / Power Supply AC100V-AC240V, 60hz/50Hz Package include 1 Portable Speaker + Wireless Microphone + Remote + Power Cord + Manual