Keep on time with the Water-Operated Digital Alarm Clock This amazing alarm clock is operated by just water - no need for batteries or wires. The electrolytes in the water can produce their own source of electricity to power up Works as a bedside clock, a daily alarm and a thermometer temperature display Easy to set up and use in any room of the home Just add fresh tap water every 3 weeks to keep it ticking Please see Full Details for product specifications Dimensions: 121.6mm x 168.1mm x 91.3 mm Save 57% on the Water-Operated Digital Alarm Clock - now only 22.99 pounds