Great for Christmas parties, celebrations, secret Santas soires, ugly Christmas sweater parties, and more! Great as a costume accessory. Batteries included and installed. One button turns it on & off and controls light modes, ranging from flashing to steady on. It’ll keep you visible from a distance, especially since Christmas events get crowded. If you’re an adult, your pals will easily be able to spot you. And it’ll keep your little ones visible at all times.