CP130Y Connect DC 5V adapter to the DC5V power input socket of speaker， and to change or recharge the speaker system. With SD/MMC， U disc reader (maximum support 2G )， MP3 format music can be played. No need to shift among U disk/SD/MMC， speaker automatically read the first input media device. If first input SD/MMC， you need to take out SD/MMC card， then speaker can read MP3 music file from U Disk. Connect 3.5mm stereo audio cable to speaker socket， LINE IN， you can enjoy the music from mobile phone， MP3， MP4， PC， iPod and other audio devices. Functional parameter of the speaker: frequency response: 150-18000Hz， signal and noise ratio of power amplifier: >=80dB. Built –in rechargeable li-ion battery. Comes with a remote control for easy and convenient control.