Portable VG280 HD 52-inch Eyewear Wide Screen Video Glasses Virtual Theatre 4GB Display 52 inch virtual screen (at 2M distance) 4:3 wide screen Radiation free LCD technology Sound 3D stereo Memory Built-in 4GB memory Support Micro TF card, up to 32GB 2GB flash memory Battery 3.7V (900mAh), built-in battery Duration about 3-4 hours Audio format MP3, WMA, WAV, APE, FLAC, etc Video format RM, RMVB, VOB, AVI, FLV, etc Image format PEG, BMP, GIF, etc Resolution 320x240(WQVGA) Frequency Response 20Hz-20KHz Interface High speed USB2.0 Language English, hinese, German, Italian, Spanish, Franch, Russian, Japanese, etc Working temperature -5C - 50C Operating System Windows2000/XP/Vista/7 Product weight 80 g Package weight 359 g Product size (L x W x H) 15.7 x 5.3 x 2.7 cm Package size (L x W x H) 20.0 x 10.5 x 7.5 cm