We only make high-quality watches, you will be satisfied after receiving them, please rest assured to buy, thank you for your support Instructions for use Built-in LED screen, 12-hour timing method Press once to light up the display time Press again to view the date, the third time displays seconds Long press the button for 3 seconds, after the real number flashes, short press to adjust the hours When the hour flashes, long press to switch to score adjustment, By analogy, the date can be adjusted. Automatically exit after 5 seconds of wrong operation Surface diameter: 33mm Dial thickness: 6mm Strap length: 230mm Strap material: DuPont paper Waterproof level: life waterproof Life time: 2 years