Mini Speaker(NS-S2001) 1.Portable speaker compatible with PC, ... crystal music with good bass3. Ultra portable,battery operated mini stereo system for your ipod4. On/off switch for you to save ... life while not in use.5. Work with ipod , ipod mini, shuffle , nano, video,MP3 player, notebook and any audio ... 2w8. Driver Unit: 40mm speaker, 4ohms9. Frequency Response: 150-18Khz Mini Speaker(NS-S2001)