・Classic Style For Men, GMT Automatic Movement,Screw-Down Crown ,One Way ceramic Rotatable Bezel,NOTE:The red&black and red&blue bezels are non-ceramic, it uses stainless steel with coating, the blue&black and black bezels are ceramic ・GMT Automatic Movement,Support Self-Wind and manual winding,Designed for accuracy, and longevity, with date function and Hacking Function (stop seconds function) ・Synthetic Sapphire crystal protects watch from scratches and solid stainless case/band(Removable Bracelet link),Luminous hands and dial (need to absorb light energy storage),Case Diameter: 40MM/1.58in ・Waterproof : 100M/10ATM(please tighten the crown when in the water),swimming and diving, is suitable for various occasions,Luminous dial and hands (requires light irradiation, Luminous lasts approximately 25-50 minutes)