Eco Drive Power Conservation Feature - Technical Bulletin

Technical bulletin from Citizen Watch Company detailing the automatic Power Conservation feature integrated into Eco Drive technology across multiple watch models. This technical communication provides comprehensive reference for understanding power-saving behavior in JR30, JR40, BL, and EW7 series timepieces. The document outlines Power Save Mode 1, where the second hand halts after 30-60 seconds of insufficient light to preserve battery charge, and Power Save Mode 2, which stops the second, minute, and hour hands after 60-72 hours of darkness. Specific movement calibers are documented: JR30 with C650 caliber (up to 4 year power reserve), JR40 with C660 caliber (up to 4 year power reserve), BL000-BL006 with E710/E711 caliber (up to 300 day power reserve), BL1 with E760 caliber (up to 5 year power reserve), and BL5 with E810/E811 caliber (up to 270 day power reserve). For EW7 models with B110/B111 caliber (up to 2 year power reserve), when unexposed to light for approximately two hours, the second and minute hands stop at 12:00. The bulletin clarifies that rapid hand advancement upon light re-exposure is normal operation signaling successful power recovery.