NVR-8580 with 2TB HDD & 4 x 4K Upscale Cameras with Heat & Motion-Sensing Spotlights, Enforcer Red & Blue Flashing Lights, Night2DayColour Night Vision & Audio NHD-875ERAmazing Image ClarityVideo to see everything thats happening by using upscaling technology that digitally creates 4K res. While not the same, these systems have a much higher res. than 1080p.Speak to SeeSpeak to See Use your voice to live stream on any Hey Google or Alexa device with a screen, including Chromecast devices. Customize & use phrases likeAlexa, show the front door.More Reliable SecurityWith Swann's True Detect, warm objects like people & cars can trigger the lights, push notifications & recording with fewer false alarms to worry about.Your Eyes OutsideMount the cameras outdoors as their weatherproof design is IP66 rated, meaning they are built to withstand rain, snow & heat, all year round.Expandable CoverageAdd up to 4 more cameras for a total of 8 to cover any blind spots. Add 4K cameras, which come