The function changes simply by rotating the clock. It has four functions: time, date, temperature, timer, and alarm. It has a backlight, so it's easy to see in the dark. *Batteries are sold separately (uses 3 AAA batteries)* 【Size】8 x 3.7 x 8cm ⭐Anonymous delivery & Free shipping⭐ ＊Please check the actual product photos for the condition♪ #Akaneko's product list is here ✨☜ 29-110161 Trade One Kururin Clock & Timer White 8 x 3.7 x 8