Battery-free and eco-friendly luminous key chain. For camping, outdoors and emergency survival kits.Soft silicone material. This luminous key chain is made in Japan and does not contain harmful substances.Both a wire chain and ball chain are included and can be used according to your preference. The start time of lighting varies depending on the type of light, but the luminous key chain glows after 15 to 30 minutes. The luminous key chain can store ultraviolet rays as energy even in indoor light. The light diminishes over time, but will last for a few hours.