Strap this CCTV tester to your wrist and make sure all your cameras are working and performing correctly. Coming with a port and cable to help inspect your CCTV security cameras, this tester is practical for the non-technician as it is not too complicated. This CCTV tester has a 3.5 inch TFT monitor that can help you to set up a CCTV camera or identify/troubleshoot CCTV system problems by displaying real-time video on its display. The power source of this tester is a built-in 18650 battery. There is even a low power warning and has both NTSC and PAL video input.
http://www.plusbuyer.com/wristband-cctv-security-tester-with-35-inch-screen-2200ma-battery-low-power-warning-p-6484.html
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