Feature: 1. High quality: made of high quality materials, safe and environmentally friendly, durable, if not man-made or accidental damage, it has at least five years of service life. 2. Lighting principle: the luminous part of the sphere is designed with high-tech fluorescent material. It can emit light at night as long as there is a light source, such as sunlight, flashlight, flashlight and cell phone. In bright light, it will light up for a few minutes with uniform brightness and can glow for 1-3 hours. 3. No batteries needed: This volleyball does not need batteries, as long as there is light or UV light, it will light up, save energy and protect the environment. 4. 2 sizes: high accuracy of engraving, good sealing, 2 sizes to choose from. Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x volleyball