Christmas String Lights Flashing LED Light-Up Colorful 13-Bulb Necklace -Length: 40" -6 Level LED operates on outer replaceable battery push button switch: 2 x CR2032 batteries (Pre-Installed, Please remove the pull-tab before use) -100% Plastic Intended for 5 Years old -Perfect party favor supply for costume outfit in Holiday, Christmas, Rave Festivals, etc.