Easy to set time This watch has time and calendar functions, please follow the instructions below: 1] Please touch the screen button for a long time until the number flashes, which means you can start to set the number, then release your hand 2] Then short press the button to set the increment of the number. After setting, release your hand. Done. 3] When you need to switch the time and calendar mode, do the same action. product info. Dial diameter: 20*47 thickness: 11mm Specular Shading : Plastic mirror Band Material : TPU Dial shape: rectangle Case Material : plastic cement