... :Polarized lens, UV400 resistanceMusic format: MP3, WMA, AAC, APE, FLACS/N ratio: -90dB Frequency response: 20Hz - 20kHz Sound output: 20mW (nominal ... dvr glassesPacking details:Unit dimension: 161 x 164 x 45 mm Box dimension:163 x 80 x 67 mmBox weight:0.23 kgQ'ty ... /Ctn:50pcs / Ctn.Ctn dimension:42 x 36 x 36 cmCtn weight:12 kg camera glasses DVR HG320 8GB ...