Details information: 

1.support usb/sd/mmc card.

2.for use with:mobile phone/ipodpsp/mp3 mp4.

3. Battery:build-in li-battery,rechargeable.

4.3.5mm audio input port.

Technology parameters:

1.out put:rms 3wx2.

2.frequency response:100hz-20khz.

3.s/n radio:>=85db.

4.lond speaker:1.5"x3w/4ohm.

5.input:3.7v.

6.built-in rechargeable.

7.li-ion battery.