These tapes are great for many uses; they can be used for marking light switches, remote controls, plugs, locks, door handles, stairs, fire exit etc. Very simple to use: simply unroll, cut to size, and remove backing strip and stick. The glow time is 6 - 8 hours exposed to natural light / 8 - 12 hours after 30 minutes exposure to strong artificial lights. Initial brightness is high, and then fades off as long as it is in the dark. Expose it to light again and it starts glowing in the dark again. It is manufactured with safety and high quality materials, which is eco-friendly, non-toxic and non-radioactive, 100% Kids & Pets-Safe. No power, no need, simply expose the self adhesive glow in the dark tape to natural or artificial light and let it light up your nights.