Customized Timing: 5 mins, 10mins, 15mins, 20mins for your cooking, brushing teeth, shower, play games, exercise timing and learning. Made of environmentally friendly plastic material, glass, colorful sand, high hardness, strong toughness, not easy to break for long time service. 4 different macaron color on the cover, fun and vitality, kids will love them, as birthday present Christmas gifts for them, help them to cultivate sense of time.