【High Quality Material】- This chemistry gifts clock measures 12 inches and is made of thick acrylic 【Absolutely Quiet】- Our chemistry wall clock features a silent sweeping quartz movement, no ticking sound to disturb your sleep 【Battery Operated】- The periodic table wall art clock runs on 1 AA battery (not included) 【Easy to Hang】- This science decor wall clock comes with a hook. Wide slots on the back make it easy to hang on the wall without installation 【Unique Gift】- A chemistry gift for chemistry teacher, science teachers, chemical engineer. Science clock for classroom, science teacher gifts. Wall clock for chemistry classroom office decor, science classroom decor, living room, bedroom, office, class, classroom, school, kitchen and bathroom. Black and white scientific art. Classroom clocks for teachers science