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Download Citizen Eco Drive Perpetual Calendar Manual E8121. All the Biostar Motherboard user manuals are usually found directly from the Biostar support English. About Eco-Drive Watches. • This Eco-Drive watch features a solar panel under the dial and is powered by converting solar energy into electrical energy. To see details of charging time, specifications and operations, refer to the instruction manual: E812 instruction manual. English. Component identification. Access support and setting instructions for Citizen watches differ by movement caliber number. To access the specific setting instructions for your Citizen watch, "Eco-Drive" is Citizen's original technology. "Radio controlled watch". Receives a time signal from one of the five signal stations located in four regions.