Umbra Ribbonwood, Large Modern Wall Clock, Battery Operated, Silent, Non Ticking, Unique, Natural WoodCLEAR READABILITY AND EASY TO HANG: Unlike other modern wall clocks Ribbon wood has contrasting hour and minute hands that ensure easy readability in any size room. Each clock has a 20 1 4 diameter and a 3 3 4 depth, and comes complete with mounting har TESTED FOR QUALITY ASSURANCE: Ribbon wood wood wall clocks are battery operated and use a single AA battery (not included) and every single Umbra clock is tested in house to ensure accurate time