From the manufacturer:
No-mess painting for kids! This exciting paint-with-water coloring book includes four reusable pages and a refillable water pen. Simply use the pen to color in each scene--details and vibrant color appear with every stroke! Then let the page dry to erase the pictures and color it in again and again. This occupations-themed book includes four scenes to color (doctor, firefighter, construction, police), and a search-and-find activity for each scene. The chunky-sized water pen is easy to hold and stores neatly right in the front cover, making this Water Wow! an ideal travel activity book and travel toy for kids!