Cra-Z-Art Shimmer 'n Sparkle Secret Light Up Journal Education, Learning Experience Fun and interactive for the entire family Another way for your child to expand their imagination Write about your friends, family, special events and more Includes glow in the dark stickers to add fun and color to your pages Uses 2 3 volt lithium size 2032 for the journal and three AG 3 for the pen Write secret messages in invisible ink with the invisible ink pen Cherish your memories for life