It's a great idea - a watch which takes the energy you use to power itself. It's not as sinister as it first sounds - it's not relying on your electric discharges, or your lifeblood ... instead just on the movements your arm makes when you're walking, watching TV, or scratching your head.

The system works surprisingly well. Once you've adjusted the time and date, wearing the watch for an hour will charge it for a week, assuming you're not sitting absolutely still. A button press allows you to see how much energy is stored, by moving the second hand - if it skips 10 second, it's got a day's charge; 30 seconds and it's a week - though o course the second hand stops for the appropriate time so your watch isn't showing the wrong time!

All in all a good-looking series of watches, which keep time very well and have a very clever aspect to them.

HOWEVER ... beware when they go wrong. After three and a half years, my watch started to lose its power very quickly, and didn't store more power very easily. To send it off to Seiko cost £90. I found a local jewellers who charged £42, but after getting the watch back from them it's still not working. I'll have to add to this opinion when I finally get it sorted.