This Nautical Porthole Clock is a Solid Brass 15 Inch wall mounted clock. It is a solid brass porthole wall clock for hanging in your home, beach condo, galley, or anywhere else you want to to display this great maritime timekeeper. Solid brass porthole clock has an antiqued brass finish and Porthole wall clock measures just over 15 inches in diameter with a large 10 inch clock face, and installs in seconds using 3 pre-drilled holes that are hidden behind the porthole's swivel hardware. Nautical clock runs on one AA battery. Nautical porthole clock makes a great addition to any nautical themed room.