Q-See QSD2304L 4 Channel H.264 Pentaplex Network DVR with (CIF) Realtime Recording per Channel Record & Display at 120 FPS H.264 Compression (CIF) Real-time Recording Per Channel USB Mouse Function, or Backup to Flash Drive, External Harddrive or CD/DVD-RW 2 Audio Inputs & 2 Audio Outputs Supports up to 4 Cameras