Features: (1) High quality color video at 30/25 fps recording/playback quad mode (2) Optional: NTSC and PAL system (3) Recording mode: auto record, manual, schedule, motion detection (4) Motion Detection: Area selection & sensitivity adjustment for each camera (5) Recording frame rate: NTSC max. 30 fps (quad) PAL max. 25 fps (quad) (6) USB:Optional (7) With video loss alarm function (8) Chinese/English menu switchable Specifications: Model/ Item AB-MINI104 # AB-MINI104M Compression Format : Modified MJPEG Video Input / Output : BNC 4-ch input / 1-ch output (Composite) Display Frame Rate : NTSC: 120fps 4x30fps PAL: 100fps 4x25fps Recording Frame Rate: NTSC: Max. 30fps 4x7.5fps PAL: Max. 25fps 4x6.25fps Recording resolution : NTSC: 320x112, 640x224 PAL: 320x136, 640x272 HDD Rack : Fixed, supports up to 250GB HDD # Removable.supports up to 250GB HDD Recording Time : NTSC: 155 hours with 120GB HDD # 15fps PAL: 194 hours with 120GB HDD # 12fps Recording Mode : Auto-record, Motion Detection, Manual, Schedule USB : Optional Power Adapter : DC 12V/5A Dimension (L??) : 200mm x 132mm x 80mm Weight Gross weight:2.5kg ; Net weight:0.97kg # Gross weight:3.5kg ; Net weight:1.9kg