Twelve 24 has revolutionized the clock. This E-Ink Wall Clock, formally known as the CLOCK ONE. It’s only 0.4 mm thick. Magic? Probably. It runs on one single cell-sized watch battery and has a one year battery life. One touch controls makes it super simple to use. The best part? It uses E-Ink technology. It has high contrast and a superior wide viewing angle. It’s really light too. 3.3 pounds? Almost weightless.