This model features the Caliber 0100, an Eco-Drive movement which is accurate to within a world-beating* 1 second per year. Without any reliance on time signals from radio towers or GPS satellites, it tells the accurate time with deviation of less than 1 second per year, based only on its own autonomous mechanism.
As of May 2021, for an autonomous analogue light-powered watch, according to research by Citizen Watch Co., Ltd.
This model features an Eco-Drive movement which is accurate to within ±5 seconds per year. The summation of all CITIZEN’s technologies. It tells the accurate time and keeps on running powered only by light, without the need for regular battery replacement.