Digital desk clock with radio wave clock function, with backlight for good visibility. citizen 8RZ134 Radio wave alarm clock Electronic sound alarm (changes in 4 stages) Alarm volume switchable in 2 stages (High ⇔ Low) 12-hour (AM/PM) / 24-hour display switchable Indoor environment warning (LCD display) Displays that the temperature and humidity are conducive to the occurrence of heatstroke, food poisoning, influenza, and mold/dust mites Calendar function (can display until December 31, 2099) Temperature display (-9.9 to 50°C) Humidity display (20 to 95%) With light Thank you for viewing. Batteries will be removed for shipping. There is no instruction manual. Please understand. Functions: 24/12 hour display switching Functions: Alarm function Display type: Digital