... 264 video compression aigorithm ,compression efficiency Support 4 ID hard drives,each hard disk capacity up to 2000GBManual ,timing ,alrm,motion ... source90--135VAC180--265VAC,47--63HZpower loss (does not contain hard disk)30WOperating temperature-10°C--+55°CWork humidity10%--90% ... Engine case size (mm)440x390x70weight (does not contain hard disk)≤5.5kgOur company is a leading and professional ...