14-day spring driven movement strikes the half hour and counts out the hour on a deep toned gong. 18 month guarantee.Ordering Note: These clock movements come with a free set of hands. When you select your movement and click "Additional Info" you can enter the number of movements you want to order. When you click continue, you will be presented with a list of hands that work with your movement. Choose any hands you like up to the quantity of clocks your are ordering. Be sure to choose lengths that are appropriate for the clock faces you'll be using.