Time will literally roll by with this amazing clock. Every 60 seconds, a chrome ball comes onto the minute track and takes its place in line. Then, once an hour, all 59 minute balls roll down the track and out of sight. H.G. Wells would have loved the reliability of this time machine. A fascinating classic for all time. Measures 8"x 10" x 6-1/2". Requires 4 "C" batteries, not included.