Blue Planet Digital Watch J-56 Waterproof, Beautiful Condition, Adjustable, LED Blue Light, Stopwatch, Alarm Function CR2032 G212 Black ⚫︎No instruction manual included. ⚫︎ The battery is currently working, but it uses a standard CR2032 button battery. It can be replaced with a precision screwdriver, but I haven't changed it since I bought it a few years ago, so it might run out soon. ⚫︎ Time has been set. ⚫︎ Features a stopwatch and split function. The protective sheet is still on the front because I haven't used it. Please peel it off if you wish to use it. I'd like to say it's almost unused, but there's a tiny bit of dirt around the screws on the back. Otherwise, it's in extremely beautiful condition. I don't know how to set the day of the week at the top of the screen.