Product Specifications Movement: Multifunctional Quartz Movement. Type:Fashion & Casual Features: Chronograph, 3 atm waterproof, Luminous Hands, Calendar, Hour, Minute, Second Water-resistant depth: 3ATM Watch weight: 108g Band length: about 220mm (available to wear) Bandwidth: about 20mm Case size: about 43mm Case thickness: about 11.5mm Function Demonstration 1/10 microsecond Indicator Minute dial (the middle one): 1 circle = 1 hour Second dial (the bottom one): 1 circle = 1 minute Calendar Window: date (The date is factory-set, please adjust the date before use. HOW TO USE THE BUTTONS? Start/Stop Button – Press the button, the chronograph will start to work; Press again, the chronograph will stop working. Crown - Pull out to the first grade to adjust the calendar. Crown - Pull out to the second grade to adjust the time. Reset Button – Press the button, the chronograph will back to the original position. Luminous Function: Luminous parts glow in the dark continually after absorbing enough light. Waterproof Function(3ATM): It can be used when rainy and you are washing hands (without hot or warm water). CAN NOT be used when swimming or any other in-water activities. CAN NOT be closed with hot or warm water. Quartz movement Quartz movement Read more