This is a collaboration wristwatch between Roar and Steelcraft. Wrist circumference: Approximately 14.5 - 21cm Case: Approximately 4cm x 4cm Band width: Approximately 2.4cm Case thickness: Approximately 1.2cm Color: Black Case material: Stainless steel Belt material: Rubber Although the operation has not been confirmed, it was working properly before the battery died. Please contact us if you have any questions.