1,build-in rechargeable lithium battery ... Frequency Response: 150-20KHz5. Battery capacity: 800mAh Function:1. Portable and small design.2. Button: Power ... Drive.4. Can connect all MIDI devices with 3.5 audio interface to play music, ... , MP4, music mobile, laptop, iPod.5. With remote controller6. Built-in Lithium battery.7. LED ... MP3(USB Flash Drive/SD card)10. With FM Radio, clock, alarm clock, auto- ...