The H2O Powered Alarm Clock needs no batteries or power cord. Just flip the top open and fill it with ordinary tap water. A natural chemical reaction inside converts ions into enough clean, eco-friendly power to run the clock indefinitely. All you have to do is replace the water every six months. A built-in memory chip ensures you’ll never have to reset the time. Features 12- or 24-hour time display and daily or hourly alarm. Available in charcoal, blue or red.