CafePress - Periodic Table Clock - Large 17" Round Wall Clock, Unique Decorative Clock Measuring an impressive 17" in diameter, this Large Wall Clock is easy to read from across the room. The eye-catching clock has quality Quartz movement and operates on a single "AA" battery (included). Measures 17" in diameter Quartz movement Plastic body and face Runs on single "AA" battery (included). IMPORTED.