... card slot Digital portable Mini speaker for Iphone, computer,CD, MP3 & Mp4 mini speaker, computer speaker, speaker,mini computer speaker, usb ... of ordinary, with many colors, several solution, for your option4. Several power supply manners including battery, computer USB, adaptor ... diameter 45mm), Magnetic resistant 4 Ohms*Power supply: 5V/1000mA AC power adapter, Built in Rechargeable Li-ion Battery ...