How to glow in the dark: When you are at night, put the product in under the light for 10 seconds, then closed the light you will see the product glow in the dark.Planets in the solar system: According to the distance from the sun, they are Mercury (☿) , Venus （ ♀） , earth (⊕), Mars（ ♂） , Jupiter (♃), Saturn (♄), Uranus (♅), Neptune (♆ or ⛢).Product description : Name ： luminous keychain Material: alloy + glass Fluorescent Material: Environmentally friendly, no radiation Color: silver Chain Type: Link Chain Chain Length: 3.15" Glass Ball Diameter: 0.72" Package Including: 1 Piece keychain