Perhaps one of these days we can get the smartphone manufactures to design a specialty phone for us to use as a portable monitor. But until that happens, this little wrist monitor is great. I hate to sound lazy, but if you have a 16 camera system or more to set up and they have OSDs or simply just want to be able to mount and adjust the aim without running back and forth to a recorder, this little unit is indispensable and it costs less than $100! For older guys like myself that don't quite have the "visual acuity" we used to have the 2.5 inch screen is a little small but I have no problem seeing the display with my reading glasses. Like I said, if you are a professional CCTV installer or are simply installing a large number of cameras, this monitor is a must have!