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. [Promaster 35th Anniversary Limited Model] Citizen PROMASTER is an authentic sports watch that combines functionality, durability, and safety. A limited model of the SKY series has been released that expresses the design theme Midnight Sun that colors the 35th anniversary. This special design is inspired by the sun that never sets all night, which can be seen at the Antarctic and North Pole in summer. This is a special edition with the 35th anniversary logo on the back cover. [Gorgeous expression of sports luxury] The gray case and band are accented with cherry color, which is reminiscent of the never-setting sun in polar regions such as the North and South Pole. The scratch-resistant sapphire glass and luminescent hands and indices ensure excellent legibility. [Citizen's radio-controlled clock that keeps accurate time at all times] Equipped with Citizen's proprietary light-powered Eco Drive technology that eliminates the need for regular battery replacement. A world time radio clock that synchronizes to accurate time no matter where you are. It is packed with radio-controlled clock technology that Citizen has been challenging for 30 years. [Details for long-term use] The sapphire glass is scratch resistant and highly transparent, and has a non-reflective coating that prevents light from reflecting on the glass surface. Water resistant to 20 ATM, suitable for marine sports. Convenient date and luminous (hands + index). [Product details] Photovoltaic Eco Drive radio clock, ±15 seconds/month (when not receiving data), Photovoltaic generation: Approximately 3.5 years (when power save is activated), Sapphire glass (non-reflective coating), Case/Band: Stainless steel, Water resistant to 20 ATM, type 1 magnetic resistance, luminous (hands + index), aviation slide rule, limited to 5,600 pieces worldwide *Detailed operating instructions for the watch can also be found in the instruction manual on the manufacturer's website (model number: U680).