This swing movement features chimes striking, accurate hourly melodies for great time management Ideal for offices or classrooms The standard size fits most clock cases (1-3mm panels) with 13mm shaft and 5.5mm thread specifications DIYer enthusiasts and repair technicians appreciate the easy installation Specially designed quiet movement minimizes operational noises, maintaining peaceful environments for bedrooms or quiet spaces The noises reduced mechanism promotes better sleep during nighttime hours Crafted with component through precisions injections molding, this light yet sturdy movement resists damage better than metal alternatives Enjoy classical melodies from the built in music box, creating a refined ambiances in living rooms or studies The soothings chimes transform every hours into a moment of auditory delight without disrupting your activities