If it is not worn for a day or two the “automatic “ feature stops and you have to reset time/day/time. I would not buy another watch without a battery or eco-drive.
Citizen Response
I've had the watch less than a month and I had to return it due to it being defective. I took it off at night and three different times I woke up and the watch was 3-4 hours off. I had to change the time three different times. The watch has been returned to be replaced or refunded and I have not heard anything from Citizen.
Got this for Christmas to replace my Luminox. I have had three Luminox watches that I used in the water often. Luminox quality has definitely declined. I asked for this watch due to it being automatic and the illuminating characters. The illumination lasts an hour compared to the indefinite Luminox illumination. I can wear the Promaster all day. Set it down overnight and by 6 o'clock that following day it has stopped. I bought a automatic winder that rotates every 6 mins. alternating directions for two minutes. Still will not hold time if it is set down for 24 hrs.
A beautiful watch. Looks good even on my larger frame. I wish it were 45mm and had at least a 22mm lug width. I prefer 24mm. I bought a black Citizen metal bracelet and replaced the narrow rubber one. It looks much better.