![]() Key elements to obtain the high claimed accuracy are applying a for a watch unusual shaped (AT-cut) quartz crystal operated at 2 23 or 8 388 608 Hz frequency and thermal compensation. ![]() In 2018 Citizen announced it developed the Caliber 0100 Eco-Drive prototype autonomous high-accuracy quartz watch movement which is claimed to be accurate to ± 1 second per year. This watch features a ring-shaped solar cell surrounding the watch case sidewall. In 2012 Citizen announced the Eco-Drive RING Concept Model. This makes radio-controlled timing possible in remote areas that are not serviced by land based radio time signal stations. ![]() The Concept Model 2011 was the Eco-Drive SATELLITE WAVE that has a movement that can receive time synchronization signals from GPS satellites. These Eco-Drive Concept Models are generally shown at exhibitions and produced in limited editions. Since 2009, Citizen has developed Eco-Drive Concept Models as technology demonstration and marketing tools.
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