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Description:Features: 1) Glasses: a) Lens of polaroid from America company b) TR 90 flame c) Shock proof and anti-static electricity 2) Audio: a) Compatible formats: MP3 / WAV / WMA b) Stereo sound c) Voice output power: 5MW + 5MW d) Voice output frequency: 20Hz - 20kHz 4) Battery: a) Continuous playing time: 6 hours b) Rechargering time: 3 hours c) Built-in lithium-ion polymer battery: 3.7V, 180mAh d) Automatically detected battery voltage and capacity e) Auto power off 5) Memory storage: a) Available flash memory size: 128MB / 256MB / 512MB / 1GB b) Standard USB 2.0 port c) Integrated USB drive d) Share same USB port for download, upload and charge 6) Accessory: USB cable, car charger, adapter, disc, user manual 7) Colors: black, silver, green, blue Packing: According to the customers' requirements