E61.501

ETA Flatline E61.501 PreciDrive: 1.95 mm height, 18.20 mm diameter. Includes hours, minutes, small seconds, E.O.L. display, and 9 jewels. Theoretical battery life is 28 months (14.5 mAh) or 39 months (20 mAh). PreciDrive technology employs thermo-compensation to regulate motor pulses against temperature changes, enabling COSC-level precision if kept at 20°C–30°C without impact; the hermetically sealed quartz/IC design prevents moisture-related accuracy issues.