and High Quality! Easy and Convenient to use. Set the alarm or time, please follow the direction indicated by the next to the knob, otherwise it may cause the alarm to be inaccurate. The alarm clock has a circular diameter of 5 cm. Material: , Metal Quantity:1 Size:5x7cm The choice for office workers student family and so on This model is a mini metal small alarm clock with a diameter of 5cm. Please check the size before purchasing. Its really very small and practical Small and light weight for travel This mini alarm clock uses button electronics (models 13 or LR44), each alarm clock will be assembled one, the spacers will be removed when using, the alarm clock can be used normally. Item color displayed in photos may be showing slightly different on your computer since monitors are not calibrated same. 1 x Alarm Clock A button electronics has been assembled Good choice for decoration, as a special present Please allow 1-5mm errors due to manual measurement. The main body is metal and the back cover is ABS . Its Really Very Small And Practical Quantity:1 A Button Electronics Has Been Assembled Item Color Displayed In Photos May Be Showing Slightly Different On Your Computer Since Monitors Are Not Calibrated Same. The Main Body Is Metal And The Back Cover Is ABS .