This clock is half mechanical and half battery operated. The alarm rings the bells and the movement is quartz. Use 1 AA battery. It also has a button on the back that will lights up the dial for easy night vision. Measures appx. 4 inches dial by 4 inch high and about 2 inches wide. A few customers feedback; It was packed with love and care! Its a beautiful cuckoo! Very good directions made it easy to unpack and start. Already up and working perfect. I will definitly buy from this seller again. Highly recommend. You even get an article on the history of Cuckoo clocks! Albert Schwab Classic Musical 1 Day Cuckoo Clock w/Silencer #184 (#335944290011) Buyer: goldie5672 (123) Best purchase I've made !! Excellent packaging!! Excellent condition!! Excellent instructions for setting up my beautiful Cuckoo Clock!! Nice story about the origin of the Cuckoo Clock and about the Cuckoo Bird!! How thoughtful!! Two cute charms,a deer and a Cuckoo Clock!! A certificate of congratulations for Clock!! Such care displayed!! I'm extremely happy with my purchase!! I love heading the Cuckoo bird and the beautiful music!! Best purchase ever!! Bachmaier Klemmer Classic Musical Series Cuckoo Clock #182-Earth Day Products! (#335900896651) Item photo(s) from verified buyer Buyer: sje3451.bgrq2srqaz (308) great seller, well packed, beautiful Disney ?Happiest of Time? Cuckoo Clock Style Quartz Clock (#335844532273)