12" Glass Wall Clock with Train Locomotive Engine Design Material: Tempered Glass Durable and hard to break Dimension: 30 x 30 x 2 cm (11.81 x 11.81 x 0.79 in) Battery: 1 x AA Battery (NOT Included) Note: Please use low voltage 1.5v carbon zinc batteries such as panasonic or generics. Use of heavy duty alkaline or rechargeable batteries causes fluctuation and may cause inaccurate time