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! Specifications: LED Colors: 2 Blue, 1 Jade, 1 Orange, 2 Red Diameter: 8.25 in. Length: 25.0 in. Batteries: Includes 3 Replaceable AG13 Batteries