A beep will sound, indicating the watch has been reset to factory defaults. 🔋 Charging Tips
Since your watch is an Eco-Drive, it uses light to charge a rechargeable power cell rather than a standard battery. What is Eco-Drive? - Citizen Watch US citizen eco drive gn-4w-s-12g manual
: The first four alphanumeric characters (e.g., E870, H800, B642) represent your movement caliber. A beep will sound, indicating the watch has