... unimpeded support TFcard . Rechargeable Li-ion Battery mini digital sound box speaker aluminum housing1. Powered via: Built-in Li-ion battery ... : 3.7V 600mAh4. Frequency: 100Hz-18KHz5. Rated Output: 3W6. Audio Socket: 3.5mm stereo jack7. Audio Source: TF card,PC,MP3 ... ,MP4,MD,CD,DVD player, Mobile phone,etc 8. Switch available, volume adjustable9.100% perfect design. with no loudspeaker, you ...