The band is made of TPU??soft and comfortable to wear</br>Senior acrylic mirror??high transparency??compressive and abrasion</br>The watch is waterproof 50 meters uderwater.Note:Please do not action button underwater</br>Luminous designed??make the night not dark??more easy to check the time at the night or where the light is not strong</br>A big digital display??makes it easier to read the time</br></br>Product Description</br></br><br><b>Features:</b> <br><b>?</b>Original japanese quartz movement <br><b>?</b>Dispaly Hour?? Minute?? Second?? Day and week <br><b>?</b>12/24H Format <br><b>?</b>1/100 Second chronograph <br><b>?</b>LED Back Light <br><b>?</b>5 ATM Waterproof - 50M/165 ft <br><b>?</b>Alarm function <br><b>?</b>Shock resistant <br> <br><b>Product parameters :</b> <br>1. Case Diameter: About 5.0cm <br>2. Band Length: About 28cm?? can Suitable circumference 17-22 cm wrists to wear <br>3. Band width(cm): About 2.4 cm <br> <br><b>Material: </b> <br>Mirror Surface:Senior acrylic mirror <br>Band Material