** You might see "Black & White Screen" or "Blinking Screen" if the PAL and NTSC are mixed up eg. You connect a PAL camera to NTSC CCTV Appliance.
** Warning: Each camera has been tested by using CCTV system to make sure it is working properly because we need to manually adjust the Len to a "clear" level before locking it up by glue/screw. The camera will burn only if you connect the + / - cables wrongly to the camera or connect an over voltage power source. Please use the default cable shipped with the camera only because not all cameras have the same pin layout on the PCB. Due to this reason, exchange/refund will be offered only after the camera is returned back to us for inspection. Thank you for your kind attention.