Material: metal baking paint + glass panel + ABS back panel Size: 4 inches: 16.5*10.5*5.5CM Battery: 1 AA5 carbon battery (need to purchase by yourself) Dimensional Dial: 4" Neat Dial with Dimensional Numerals instead of the printed cardboard commonly found in the general market. Loud Alarm: Ideal for heavy sleepers, mild hearing loss or even deaf people. No snooze button, making it a great wake up clock for anyone who has trouble getting out of bed. Easy operation with just two buttons for setting time and alarm time. Noiseless: High-quality smooth sweeping, silent sweeping seconds, silent, no annoying ticking, wriggling second hand creates a quiet sleeping and working environment. Night Light: Press and hold the light button, the night time is clearly visible.