Target: Men's Allergic confirmation: Nickel allergic product (display by manufacturer. Please check the product before use.) Japan Waterproof performance: 20 aThesis waterproof Average monthly difference ± 15 seconds (at non -reception), PERFEX installation (JIS1 type magnetism, needle correction function, shock detection function) Japan -China -US European Radio Receipt, Aviation Captures Stick Function, Chronograph Function (1/100 seconds, 24 Hours)