The Seiko 5 is powered by an automatic, self-winding movement. This means that the watch is powered by the natural motion of the wearer's wrist, eliminating the need for a battery. It's a hallmark feature of the Seiko 5 series. "5" Key Attributes: The name "Seiko 5" is derived from five key attributes that define the collection: Automatic Movement: As mentioned, the watches are automatic. Day-Date Display: Seiko 5 watches typically include both day and date displays on the dial. Water Resistance: Seiko 5 watches are designed to be water-resistant, making them suitable for everyday wear. Durable Case and Bracelet: Seiko 5 watches often feature a robust stainless steel case and bracelet, ensuring durability. Recessed Crown at 4 o'clock: The crown of Seiko 5 watches is typically positioned at the 4 o'clock position, contributing to a distinctive look.