Hardwood wall clock has black numbers, minute marks, and hands, and brass second hand with quartz-movement. Clock has hardwood frame and a glass crystal. Uses one AA battery, not included. +/- 1/3 second-per-day accuracy.All plastic clock frames will biodegrade within an average of 2 years in a landfill environment (reference ASTM D5511.) Plastic bodies contain 30% post-consumer recycled content.