IP501 Surports mobile phone which has MP3 function compatible with 3.5mm stereo audio input, e.g. CD, PC, VCD, DVD, TV, ETC supports MP3/CD/PMP/Notbook Surports USB data connectors supports volume control DC Power adaper input provide four AAA batery for outdoor use Full remote control Blue tooth function foldaway Color: Offwhite Size: 25.6x14x3(cm) Weight: 0.57kg(package included) Channel: L/ R Output Power: 2x2W Working Voltage: DC/6V(four AAA batteries) & DC/8V (External power) Frequency: 100HZ~20KHZ Sensitivity: 80dB THD<0.1% MOQ:500pcs