As we are a Japanese shop, please take the following precautions when purchasing certain products. [Precautions when using electrical appliances] When using electrical appliances, please note that the voltage is different from that in Japan and may cause malfunctions. The plug type is Japanese type (A or B type), so please check the voltage before using a transformer. Please note that a transformer is different from a conversion adapter. We are not responsible for malfunctions caused by use without a transformer. [A classic diver's watch now available in boys' size with a case diameter of approximately 37 mm] PROMASTER is an authentic sports watch that can withstand even the harshest environments. A boys size version with a case diameter of approximately 37mm is now available in the basic diver series that is waterproof for 200m diving. The perfect size, neither too big nor too small, fits women and men with thin wrists. This model can also be enjoyed as a pair watch. [Sporty design that can be used for everyday use] A full-fledged diver's watch that meets ISO standards. The hands and indexes have a luminescent finish that makes them easy to read underwater or in dark places, and they also ensure magnetic resistance and robustness. [Diver functions] Full-fledged functions designed for safety during diving, such as waterproof for 200m diving, luminous hands and indexes that are easy to read underwater or in dark places, unidirectional rotating bezel to prevent malfunction, and screw-lock crown. It's fulfilling. [People-friendly functions and performance] Equipped with a photovoltaic eco-drive, making it hassle-free. Converts a small amount of sunlight or light into electricity. Once fully charged, it will continue to operate for a long time even in the absence of light, so there is no need to regularly replace the batteries. [Product details] Photovoltaic Eco Drive, accuracy ±15 seconds/month, approximately 6 months, waterproof for 200m diving, crystal glass, case: stainless steel, band: urethane, type 1 magnetic resistance, luminous (hands + index), reverse rotation Prevention bezel, screw-lock crown *Detailed operating instructions for the watch can also be found in the instruction manual on the manufacturer's website (model number: E168).