【Product Name】 SEIKO SUPER RUNNERS Digital Wristwatch 【Product Overview】 I believe I received this around 2008. At the time, I was running over 400km a month and training hard. The battery died once, and I replaced it myself (the waterproof function is gone). After that, I used it normally, but I don't remember if the battery died or if it stopped working. Given my personality, I probably avoided getting it wet, but there's a possibility it broke due to sweat. I don't remember, so I'm listing it as a junk item.