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ALLSpecifications: PC interface supported:USB Digital formats supported: MP3/WMA Signal-to-noise ratio:87.2dB Playback Modes:Random play External hard drive function: Yes Audio Additional features:Auto-power off Earphones type: Binaural Mfr estimated battery life :5hours continuous Charging Time:3hours continaully Battery tape/capacity: Built-in Lithium lon Polymenr/3.7v,150mAh Maximum imput power rating:5VDC,150mA Voice output power:55mW Voice output frequency:20Hz-20Khz earphone impendance:16 ?*2 Memory Flash:128MB-4GB Lens: "The resilient glass, which is comprised of 11-layer materials, is introduced from polarized lenses produced by an American company Polaroid. The flip-up lens is a material that blocks 100% of all UVA, UVB, UVC and harmful blue light " Earphone & keys functions: Packing: color box Gift box measures: L190mm*W85mm*H100mm G.W: 224g N.W: 213g Carton Demesions: 525*395*468mm G.W: 13Kg N.W; 11.2Kg Qty per carton: 50pcs Qty per 20container: 329cartons(16450pcs) Qty per 40container: 670cartons(33500pcs) Certificate: CE Made in : China