You can use this Glow in the Dark Jellyfish Ornament all day, every day. Of course, most people will just use it on their Christmas tree, and that's fine. But if you want to enjoy it year round, we recommended hanging them from the rearview mirror of your car or from the ceiling of your room. After they've been exposed to light, they will glow in the dark! These are perfect for someone who is afraid of the dark unless what they're afraid of is jellyfish. If you do put them on your Christmas tree, buy a bunch so when the lights go out, these glow-in-the-dark wonders will turn it into an undersea wonderland.