Input Type D-Type Connector Video Input 4 Channels Audio Input 4 Channel Audio on Board, 1 Channel PC Audio Alarm Input/ Output 4 Channel Alarm Inputs, 1 Channel Alarm Output (via alarm board) Extensions Stackable up to 16 Channels (up to 4 cards) Compression Format H.264 (Modified) Display Frame Rate 120fps (NTSC)/ 100fps (PAL) Recording Frame Rate 120fps (NTSC)/ 100fps (PAL) (under CIF resolution) Display Resolution 704 x 576 Recording Resolution 704 x 480 (NTSC), 704 x 576 (PAL) Recorder Media HDD, USB Disk, ZIP, CD-RW Record Mode Motion/ Sensor/ Schedule/ Manual Network TCP/IP PTZ Protocol Configurable, Remote Control Capability Card Dimension 8.50" (W) x 5.00" (H) Card Weight 0.36 lbs Package Dimension 10.75" x 7.50"x 2.00" Package Weight 1.28 lbs System Requirements OS Supported: Windows 2000/ 2003/ Windows XP/ Windows Vista. CPU: Intel P4 Celeron Processor 3.0G minimum, Intel PD Dual-Core 2.8G above RAM: 2.0G minmum HDD: 160 GB. DirectX: 9.0c or above.