With our USA Tube Necklace to the colors you'll be true. Wear flashing LED's of red, white and blue. Get some flashing necklaces. Oh what the heck. Its fun to have light chasing round and round your neck. - To activate, push the black button located on the battery housing. - This necklace attaches magnetically. - To attach, simply pull apart the magnetic piece, put the necklace around your neck and attach in the back. - Enjoy! Diameter (when attached): 8.25 in. , 20.95 cm. Length (when not attached): 25.0 in. , 63.5 cm. LED Colors: 1 Blue, 1 Red, 1 White Batteries: Includes 3 Replaceable AG3 Batteries.