Please read my profile before purchasing. m(_ _)m Purchased at the Osaka-Kansai Expo and worn for about 3 hours once. The initial built-in battery has since run out. This light-up wristband will stand out at the Expo venue as the nights get longer! ⭐︎ The battery is replaceable, so you can use it again even if the light runs out. It is said to have 15 light patterns! (I only noticed red and blue lighting up.) Direct purchase without comment is welcome. Please feel free to ask any questions.