To activate your Green Sequin Necktie with Green LEDs, look for the sticker placed over the hidden button & press there. Choose from flash, blink & steady light options. To wear it, there is an adjustable zipper in the back - wear the piece like a necklace & zip it to your liking. Dimensions: 21" long & 2.5" wide at it's widest, the base of long tie. LED colors: 5 Green Comes ready to use with 1 replaceable CR2032 Battery.