... shell,Alloy steel,antiwear 3. Exquisite design,easy cooperating. 4. Pneumatic pressure cone technology,neodymium iron boron speaker,perfect quality ... power,built in 3.7v 500mah lithium battery,external dock 3.7v 1020mah battery,it can be used as power bank ... .1+EDR 7. Using for meeting,travelling,car kit,children teaching. mini wireless bluetooth speaker for iphone 5/ iphone 4S/galaxy S2/GALaxy S3/iPad ...