Valdler 12-Inch Silent Non-ticking Indoor Wall Clock with Metal Frame and Front Glass Cover 1.Not all batteries are created equal,please use carbon zinc batteries only. voltage:1.5V.For examples: panasonic voltage:1.5V 2.DO NOT USE heavy duty, alkaline battery,rechargeable batteries.These batteries are not recommended due to fluctuations in the way these types of batteries disperse power.For example:Duracell alkaline battery. 3.This matal-framed wall clock measures 12 inches in diameter.Large Arabic Numerals and glass front cover guarantee good view. 4.Super-quality Quartz Sweep Movement guarantees accurate time and absolutely silent environment;Plastic Case And Lens, makes it easy to clean and keeps dust away from dial. 5.A Wall Clock looks most at home hanging in an office.