The Aradora chess clock is a quality chess clock and a sensible choice for schools and tournaments purchasing higher quantities and looking for a good value. This clock runs quietly for an analog clock and it comes in an attractive and durable plastic case. It's larger size makes it easy to view during tournament play. The large toggle switch on top makes it easy to switch clocks quickly. Plus, it has the added feature of a lock for stopping both clocks without having to find the neutral zone on the toggle switch. Clock will run 24 hours on a single winding.