The mechanical series, affectionately known as the "TSUYOSA" Collection overseas. It features a simple, basic combination of hands and indexes, and its clean design is appealing. The wide variety of vibrant colors adds an accent to your outfit. The see-through back allows you to enjoy the rotating rotor and the movement of the mechanism unique to mechanical watches. Specifications: ・Accuracy: -20 to +40 seconds/day ・Running time: Approximately 40 hours (when fully wound) ・Functions: Mechanical automatic + manual winding ・Water resistance: 5 bar water resistance ・Glass: Sapphire glass ・Case/Band: Stainless steel ・Luminous (hands + indexes) ※We ask that you have the band adjusted at a nearby watch store. Please contact the store directly for information on fees. About Mechanical Watches: This watch is a mechanical automatic watch powered by a mainspring. When you wear the watch on your wrist, the rotating rotor inside the watch moves with the movement of your arm, and the mainspring is automatically wound. Even when your arm movement is limited and the mainspring cannot be wound sufficiently, you can manually wind the mainspring. Please refer to the "Instruction Manual" on the product page of the manufacturer's website for detailed operating instructions. CITIZEN COLLECTION Citizen Collection pursues the basic performance and design of watches, including Eco-Drive, radio-controlled watches, and mechanical watches. Model number: 321_NJ0150-81Z Gender: MEN / WOMEN