You need a light source that will never, ever let you down, and the UV GloStik is it! This rechargeable glow stick will glow in the dark all night long and then recharge during the day by absorbing any light. It’s perfect for attaching to your backpack, keys or anything else you need to find in the dark because it is lightweight, waterproof and completely reusable and reliable. Made of non-toxic materials, it will last forever because it never wears out and will work in any temperature! It will recharge with one minute of sunlight, 5 to 10 minutes of ambient light or just a few seconds of using a high intensity flashlight. Using a flashlight will make the crystals super bright. It glows more than 12 hours and is bright enough for you to see in the dark.