- The numbers and hands of JoFomp glow in the dark wall clock are coated with phosphor, which needs to absorb enough light energy during the day to show up as fluorescence at night. The glow in dark clock will glow in the dark for 3-6 hours, depending on the light energy absorbed during the day (the brightness of the glow-in-the-dark cannot remain at its brightest all the time, and will gradually decrease over time). - This wall clock silent non ticking uses a high-quality quartz movement to sweep, while walking accurately, but also to maintain a quiet environment, so this modern wall clock that glows in the dark is very suitable for friends with poor sleep quality. If you have a friend with the same problem, you can give this clock as a gift to them. - The luminous feature of the light up wall clock allows you to see the time easily at night, while avoiding the bright light generated when you look at the time with your mobile phone at night, which causes eye discomfort. It is the best choice for living room wall clock decorative and glow in dark wall clock for bedroom night glow.