Luminox. "Navy SEALS". My wife's idea. It's right twice a day; sometimes it runs all day for a few days. Yes, I replace the batteries, but there is something wrong with the watch. I have replaced the band several times, even "unbreakable" bands. I am not impressed by the watch, but more than once I've been asked "Is that a Luminox? Do you like it?". I respond "it's right twice a day and I'd never buy another one."