This kinetic perpetual calender watch is powered by the movement of your body and requires no battery change ever. Once set, the calendar automatically adjusts for even and odd months including leap years up to Feb 2100. When the watch senses 24 hours of inactivity it puts itself into suspended animation (sleep mode) to conserve energy. The date continues to advance correctly while the watch is asleep. Wake it up with a few shakes of your wrist and it automatically resets itself to the correct time even if it’s been asleep for up to four years.

Seiko Arctura Kinetic Perpetual Calendar SNP009

Features
Movement : Kinetic (no battery required)
Calibre: 7D46
Water resistance: 100m
Scratch resistant Sapphire crystal
Diameter: 46mm including crown
Thickness: 12mm
Stainless Steel Case and Bracelet
Bracelet Features a Push Button Release Clasp
Lumibrite on Hands and markers
Silver dial