Patented's shock absorber design, Make Hard Disk never to be bad from shaken1) 4 channel video and audio recording2) Video format:1D1(25fps) + 3CIF(25fps) 3) Alarm input: 4 alarm input, No alarm below 4V, high level alarm above 4V 4) Compression: H.2645) Data Storage:MAX support 2TB SATA HDD and 64GB SD Card.6) Motion detection / timer switch / alarm recording7) Dual shockproof (Patented design)8) Suport USB port9) Operation Temp.:-30?~+80? 10)Power: DC6?32V11))Language: Chinese/English/Russian12))Certificate: CE FCC ROHS