The Le Chateau Dynamo Automatic Watch functions without a battery, instead powered automatically with the movement of your arm. This watch is 10 ATM water resistant and features a see-through case back.*Case: Stainless steel with brushed finish

* Caseback: Screw-down

* Bezel: Brushed stainless steel

* Dial: Silvertone

* Hands: Black arrows, luminous

* Second sweep

* Markers: Luminous Arabic numerals

* Subdials: 24 hour subdial next to 9 o'clock

* Calendar: Date at 3 o'clock

* Strap: Black leather band with silvertone accents

* Clasp: Tang buckle

* Crystal: Mineral

* Crown: Push/pull

* Movement: Japanese automatic with 21 jewels

* Water resistance: 10 ATM/100 meters/330 feet

* Case measurements: 42 mm wide x 42 mm long x 13 mm thick

* Strap measurements: 24 mm wide x 8.25 inches long

* Model number: 7081m_sil Men's watch bands can be sized to fit 7.5-inch to 8.5-inch wrists. Extra links are available through the manufacturer. (We do not provide this service). Automatic movement winds with the movement of your arm. It is recommended that you wind the watch every two weeks.