... span is normally around 5 years Specifications1.Support SD card,, USB MP3 music reading and playing,FM radio 2.External high ... -capacity lithium battery,contain LED indicator 3.Support USB interface 5v power supply, computer double track 3.5 audio ... power supply mode 5. easy to carry 6. Blackouts memory played 1,Mini portable, with high quality aluminum case, fashional, engrossing,elegant2 ...