12-inch luminous silent wall clock, Battery Operated(need to bring a carbon 1pcs AA battery,not included) Luminous function, you can clearly see the time in no light at all. The duration is about 5 hours and it gradually become darker. At this time, you need to absorb the light energy again; so after you receive the product, please let it be exposed to the outside to absorb it. Do not block the light. It needs to be lighted to have luminous at night. The it absorbs, the brighter it is! Use of luminous function: The main raw material of luminous is light-induced energy storage luminous powder, which stores light energy after being irradiated by , fluorescent light, ultraviolet light, etc. Get up, after stopping the light irradiation, it is slowly released in the form of fluorescence, so you can see the light at night or in the dark. Quiet movement, accurate time, bid farewell to mechanical ticking, very suitable for home decoration, living room, bedroom, office, etc. Fine workmanship,