Simplex Impulse Clocks can be used in all types of applications, from small offices to large-scale industrial sites. Simplex Impulse Clocks are driven by a compact ratchet drive movement that responds to an electrical impulse sent from the Master Clock each minute. Impulse clocks are individually checked for agreement with the Master Clock once each hour, providing uniform and accurate time. Any clock not synchronized with the Master Clock will be automatically advanced or retarded as required.