A new generation of Polarized Sunglasses Mp3 player! The sound and video quality are nearly perfect and are much superior than its counterparts with the same price range. Buy it Now and Enjoy and magnificent quality! Features: Digital formats supported: MP3/WAV /WMA PC interface supported: USB2.0 PROTOCOL (FS) Playtime: 5 hours Battery tape/capacity: Built-in lithium lion olmer/3.7v, 150mAh Maximum input power rating: 5VDC,150mA Voice output power: 55mW Earphone output frequency: 5mw Voice output frequency: 20Hz-20Khz THD: Less 0.05% Recharging time: 3 hours Normally works voltage: 30-35mA Memory Flash: 512MB Signal-to-noise ratio: 87.2dB Earphone impendence: 16ou*2 Weight: 52g Dimensions: 172*160*40mm Extended Length of Earphone fixed lever: 13mm Rotary degree of earphone fixed lever: 270limit Rotary degree of earphone: 90limit Colour: Black    　 Packages: Digital Sunglasses USB Cable Program CD USB Cable Manual