The glow whistle is made of non-toxic and odorless material. Powered by 3 LR41 Batteries(batteries included and replaceable). 6 Fun Whistle Colors:Blue, Green, Purple, Yellow, Pink, Red. 3 Different Modes are available: fast flashing, slow flashing, and constant. The on/off button is also used to change the mode. These glow whistle necklace feature 3 bright LEDs per color. Whistling in the dark is fun for both children and adults. Suitable for wearing the in club, Party, Rave, Disco, Concerts, Dinner, Birthdays, Festivals, Halloween, Weddings, Night Activities and etc.