Musical movement is a very precise mechanism, so please pay attention to the following items when it is used or assembled. 1. Please drive the mechanism in the right way and don’t exert an unusual extra power on other parts lest gear damage or spring decoupling. 2. When winding up the spring-driven movement or extracting the key, please don’t operate severely. The explosive force which is formed from severe operation ,will aggravate the wear and tear of the gear, reduce the serve life of the mechanism, even be damaged.