* Popular "LDK" Best Buy Award-Winning Smartwatch Purchased on Amazon at the end of October for 4980 yen. I used it for one week, only at night, because I wanted to know my sleep patterns. * From the following site: [Product Specifications] Watch size (length * width * thickness): 4.2cm * 3.5cm * 1.0cm, Belt width: 20mm, Wrist circumference: Approximately 15.5cm～24.0cm (including the main unit), Material: Zinc alloy + PC Thank you very much.