For those who prefer 24 hour clocks over 12 hour clocks. Perfect Zulu 24 hour time. Arms are silent - no annoying 'tick..tick...tick' noises. Also available in a white dial. These clock movements require a quality brand name or high alkaline battery. Always check to ensure battery is placed in the cradle correctly (+ to + and - to -) and then give it a slight 'roll' to ensure contact is made.