... TF card. FM radio-autiomatic search channels MP3 speaker 2.0speaker bluetooth mini speaker for iphone, mobile phone 1. Special Doss voice ... easy cooperating. 4. Pneumatic pressure cone technology,neodymium iron boron speaker,perfect quality sound. 5. Dual power,built in 3.7v ... for meeting,travelling,car kit,children teaching. 8. The bass speaker has a built in rechargeable battery, which can be charged ...