These holiday light up necklaces have a wide range of applications, ideal for many sorts of occasions or activities, such as holiday parties, birthday parties, winter holiday activities, cosplay parties, masquerades, seasonal events and more. Mainly made of quality plastic, our light necklace is powered by batteries inside (2*CR1632), reliable and safe, sturdy and solid, long lasting and lightweight, strong enough against breakage, cracking and fracture. Function: Button (blinking - steady on)