The amazing bedol water clock will never need batteries. It uses the ions in ordinary tap water to create clean energy. Just fill with water! When ionization is low after 6 months or a year or more (depending on your local tap water composition) just pour it out and fill with new water. It’s that easy! Squirt even remembers the time as you change the water. Has a daily and hourly alarm: 12 hour or 24 hour time settings. Let’s stop polluting the environment with dead batteries! Save money on batteries and power your clock with a renewable resource - water. Time powered by water, another leap forward towards a greener planet. H. 9 cm.