Hey tough cuckoo! The Karlsson Duo Cuckoo Clock has the appearance of a tough clock, but is a cuckoo clock after all. Every hour a little birdy appears that makes soft sounds from the forest. The Karlsson Duo Cuckoo is for lovers of modern design who love the playful elements of the classic cuckoo clock. The clock is available in various trendy colors such as jungle green, mouse grey and matt white. Cuckoo!