This is an eco drive chronograph watch. Eco drive means it is a solar watch. No batteries needed anymore. The watch is also radio controlled. This means it recieves a radio signal to put it on the right time. The watch and the bracelet are made out of stainless steel. The watch has a mineral glass.The diameter of the watchcase is 46mm and thickness 13mm. The watch is new. It comes with a 2 year international guarantee from Citizen Europe.