Mr Beams MBN342 Networked LED Wireless Motion Sensing Spotlight System with NetBright Technology, 200-Lumens, White, 2-Pack NetBright Motion-activated LED Spotlights communicate with each other, so when one spotlight detects motion, the other NetBright lights activate simultaneously. The MBN342 is a 2-Pack of the MBN340. NetBright LED Spotlights take just minutes to install anywhere: on sheds, trees, garages, barns, decks or fences. No electrician needed. Each NetBright LED Spotlight provides a powerful 200 lumen beam that illuminates the darkest, farthest corners of your yard. Each light uses 3 D-cell batteries (not included), which can provide up to one year of run time under normal use. Each light is equipped with four channels to allow different lighting zones around your house, with the capability of having up to 50 lights synchronized per channel! Mr Beams Spotlights with NetBright Technology bring safety and security lighting to even the largest yards, easily and affordably. Watch the video to see them in action!