Thank you for viewing. This is a Discover Light (black light) for Kodomo Challenge / Challenge. Contents • Light body only (everything in the photos) Overview • This light uses ultraviolet (black light) to make hidden images appear on special "observation books" and "observation sheets." • When used in the dark, you can enjoy "discovery play" by revealing invisible letters and illustrations. Condition • Operation confirmed (please consider replacing the batteries as this is a used item) • The sticker on the main body is slightly misaligned (please refer to the photos) Notes • Supplementary materials such as math books and observation books are not included. • As this is a used item, there may be minor scratches and signs of use. Please understand this before purchasing.