MEGIR Racing Series Sports Chronograph Quartz Wrist Watches for Men Function Guide: Chronograph: The chronograph is very weak and needs your attention, please take it carefully afer receiving the watch. Please follow the steps below to test chronograph performance: 1. Press the top button(press once only) and check if all the small dials work, please wait at least 60 seconds(1 minute). 2. Then press the top button again (press once only) to stop all the small dials. 3. Press the bottom button, check whether the small dials get back to their original positions. 4. Please don't press the buttons frequently and don't press them mixed. Since this operation will lead the movement miss its way and rules, it will make the chronograph broken. Watch Settings: 1. Date adjustment: pull the crown out once and rotate it clockwise to adjust date. PLEASE DO NOT rotate the crown anti-clockwise, if you did this action, please rotate the crown clockwise until the calendar can be adjusted. 2. Time adjustment: pull the crown out twice and rotate it to adjust time. 3. Small pointers of chronograph dials adjustment: pull the crown out twice and press the top and bottom buttons to adjust the position of the small pointers. PLEASE NOTE: The top button control the top small dial, the bottom button control the other 2 small dials. Read more 3 bar waterproof, withstands rain and splashes of water, but not showering, diving, snorkeling or water-related work. Powerful luminous function. The luminous parts will glow in the dark continually after absorbing enough light. Hardlex mirror window, super clear view makes it easily to read time at any angles. Read more Specifications Case Diameter: 1.81in approx Case Thickness: 0.55in approx Band Length: 9.45in approx Band Width: 0.98in approx Watch Weight: 3.60oz approx Read more Functions Top small dial is 1/10 microsecond chronograph dial, 1 circle is 2 second. Bottom small dial is second chronograph dial, 1 circle is 1 minute. Middle small dial is minute chronograph dial, 1 circle is 60 minutes. P.S. Chronograph dials won't keep working all the time, they will stop after working for a specific period of time if you don't stop them manually. Top small dial works for 1 minute, the other 2 small dials work for 1 hour. Calendar indicator: Calendar date period is 31 days, you have to set the date at the beginning of some months. Read more Band & Clasp Classic pin Buckle, soft sports style blue silicone band. Stylish and comfortable. Read more