Here's a bit of info from Sjor's website:Now that is a watch that made me sit up straight. How old is that model and what does it do.:think::think::think:
http://www.g-peopleland.comI also got a DW-400 working. This is a very vintage Digital Casio watch. It has a tachy meter that calculates your average speed if you input the right distance. If you use the stopwatch and stop at the time of arrival, you can read your average speed in the top display. It's also 200m water resistant, which makes this watch a bit of a G-Shock predecessor.