Transparent Watch. Movement: 1HC0A automatic movement Model: 2205 Drive: single spring drive Power storage: 72 h Vibration frequency: 28800 (times/hour) Chain up mode: automatic chain up Case diameter: 44× 54 mm Case thickness: 17 mm Width of strap: 26*20 mm Case material: crystal glass Band material: rubber Waterproof depth: 50 meters waterproof for life. Mirror: crystal glass Bottom cover: crystal glass Crown: straight in