Convenient to take out, is suitable for using at home, office or trip. Use dry battery or special power transformer. Read MMC/SD card/MP3 file (music) in USB movable disk. Stereo headphone output. Diapason tweet antimagnetic speaker. Rubber bass antimagnetic speaker. With special power transformer. Specification: Special transformer: input-AC100~240V 50/60Hz;output-DC6V800mA Battery: DC1.5V AAx4(we do not supply the battery) Speaker:1.5Wx2+5x1 Speaker size:1”±x2+2”±x1 Speaker output”źo4Ohms Frequency response range”±100Hz-18KHz SNR:>80dB Distortion:<1% Product size:L130xW130xH180mm Product weight:0.270kg Quality guarantee for one year. Made in China.