The boundaries dividing particular Citizen series aren't always well-defined. The Elegant collection, for example, features high-tech titanium watches that could very well be part of the Promaster series based on their functions and appearance. However, the showstopper of these stylish watches is the so-called Satellite Timekeeping System. Citizen has used this technology since 2011 in order to display the exact time. Watches receive GPS signals from space and synchronize themselves with the precise atomic time. Without GPS, this technology would be impossible. The Satellite Timekeeping System covers 40 time zones and its signal is available all over the world, even in the remote wilderness. This is the main difference between satellite and radio watches, which function more like a radio and require a long-wave transmitter in order to receive the time signal.
The Elegant collection alone has around 100 different models for men and women, which demonstrates exactly how large Citizen's selection is. Furthermore, it shows that Eco-Drive has won out against battery power, as solar energy is standard in Elegant models. The classic three-hand watches with date display and a gold-plated round or square case are also part of the series, as well as women’s watches set with diamonds.