CА4640-50E
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| Gender | Man |
| Movement | Quartz Eco Drive |
| Case | Steel |
| Bracelet | Steel |
| Clock face | Analog |
| Water Resistant | 100 meters |
Citizen men's watch from the OF Racing Chrono collection. The watch movement is Eco Drive quartz (solar powered) with chronograph functions, date display and 24-hour daily indication. The case is made of steel, diameter 41 mm. The bracelet is made of steel. The dial is black. Water resistance is 10 bar / 100 meters. Reference: CA4640-50E
Item shipped with official 5 year warranty and case Citizen

What is Eco Drive technology?
One of Citizen 's great challenges was to develop a technology that would ensure that the watch would function consistently , anywhere in the world.
In 1976 , the brand revolutionized watchmaking by inventing the first light-powered analog quartz watch . This innovative technology, now known as Eco-Drive , uses only light as its energy source , eliminating the need to replace the battery.
The Eco-Drive system is able to generate energy from any light source : artificial light, natural light and even dim light , ensuring continuous and sustainable operation of the watch.