Features: LED time(12/24 hour system adjustable), date and centigrade temperature and fahrenheit temperature display. Three brightness modes adjustment, the brightness can be adjusted automatically or manually. Alarm function and snooze function, the alarm sound is beep which lasts for about 1min, during the alarming time the beeping sound weakens gradually. Snooze time is 5mins by default. USB charging, external power-off protection function, convenient and practical. You can place it on your table, desk or hang it on wall at your home and office. Black and white outer shell, white, red, green, blue, pink, orange diaplay colors for you to choose from. Specifications: Material: Plastic Housing Color: black Light Color: white, red, green, blue, pink, orange(optional) Screen Type: LED Display Type: digital Power supply: USB 5V 1A Battery: one button cell battery(included) Item size: 21.5*8.5*1.7cm/8.5*3.3*0.7in Package size: 29*10*4.5cm/11.4*3.9*1.8in Item Weight: 234g/8.3oz Package weight: 248g/8.7oz Package list: 1 * Digital Clock 1 * USB Cable 1 * User Manual