In the House of 1000 Clocks, you will find 100% original Black Forest Cuckoo Clocks from world-known clockmaker factories in the region that design and produce innovatively designed battery-operated Cuckoo Clocks. All of the Clocks have a two-year guarantee. Quartz Cuckoo Clocks are powered by the batteries. A clock without music requires two batteries, one with music requires three batteries. The life of the batteries is approximately one year.