Optodigital Slim LED Bandana for Dogs, Navy, Large, Blue Lighted up slim LED dog bandanna keeps dog been seen and be save at night As a safe dog bandana, it comes with stylish design in beautiful Navy Style pattern Embedded with slim LED strip, which makes it absolutely cozy for dogs to put on Powered by 2-Piece of CR2032 battery which is included in the package; Neck size is adjustable 4-Inch long, 10-Inch wide, 1-1/2-Inch high