Batteries have a lot going against them. They're never there when you need them, usually not reusable, and filled with toxic chemicals. The stylish Bedol Water Clock does away with those alkaline pains, running entirely off of water and lemon juice. The unit can go for an astounding 6 to 8 weeks before needing a refill, still keeping time while you fill it up thanks to onboard memory. The price for this very green, very cool gadget? A measly $16. At 4 by 3.5 inches, it's the perfect desktop clock for the geeky green office.  The clock comes in blue, charcoal, orange and, of course, green.