Specification : - Function: dual Time display, alarm, calendar, week, chronograph, back light, waterproof - Band Width: 20 mm - Case Thickness: 0.9 mm - Dial Diameter: 20*55 mm - Length of watch strap(include watch case): 24 cm - Case material: plastic - Dial window material type:plastic - Dial material type: copper - Movement: digital - Clasp type: buckle - Style: sport & outdoor - Dial display: digital - Case shape: round - Bank material : rubber Description: - LED Digital Screen , it can display time and date,with large font for easy reading. 3.Single button operation - Power saving mode:If you don't press the button for about 3 seconds, the LED Display Screen automatically shut down. - Advanced manufacturing technology, wear well and wear comfortable. How to set time/Date/: Notes:When you set the time/date, pls do it when the led display screen is blinking, if the led display screen shut down, you will need to readjustment. **Press the button, Time appears, press the button again,Date appears. **Press the button,Hours/Minutes Shows,Long press on the button until the hour blinks,Short push on the button to set hours.(cycle through the hours) ** Long press on the screen again, Hours are steady, Minutes blink,Short push on the button cycle through the minutes. **After setting the current item, then Long press on the button enter the next setting, In turn set orders are: hours--minutes---Month--Date. Set a good time to stop and figures, do not press the button to save the settings.