1) Ongoing clearly record to the image/sound of the monitor object 2) A internal memory can store about 5 hours recorded information 3) Outside connection CF card up to 2G, the recording time lasts for 50 hours 4) Supports connecting single video signal (CCD/CMOS camera) 5) The recorded video has the exact time (year, month, day, hour, minute, second) 6) Video memory principle is "first in, first out", cover automatically, nonstop forever 7) Supports input/output the double video signal of NTSC / PAL 8) The images / video clips stored won't lose when power off 9) With the simple operation interface, no need to install the software 10) With the exterior trigger record pot and USB to computer 11) Supports playback the image on TV / monitor / computer 12) DV900P: 4.2V, with lithium battery built-in