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Sunglasses with 4GB MP3

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Digital formats supported:MP3/WAV/WMA
PC interface supported:USB2.0
Mfr estimated battery life:5 hours
Battery tape/capacity : Bullt-in Lithium lon Polymer/3.7V.150mAH
Maximum input power rating:5VDC 
Earphone output power:5mw 
Voice output frequency:20Hz-20Khz
THD:0.05%
Recharging time:2 hours
Normally works current:30-35mA.
Signal-to-noise ratio:87.2db
Earphone impedance :16 
Weight:52g
Dimensions:172*160*40mm
Extended Length of Earphonefixed lever:14mm
Rotary degree of earphone fixed lever:270°
Rotary degree of earphone:90°