This music box is designed to hang on baby crib holder, easy to install Spring-driven music box doesn't need extra battery, just rotate the rotary switch and then listen to sweet melody You can hang small plush dolls on the bottom hook You baby will fall into sleep along with soft and beautiful melody Help to pacify crying baby and enhance your baby's cognition of music Specifications: Condition: 100 percent Brand New Material: ABS and Zinc Alloy Color: White Suitable Age: 0-36 months Power Supply: Spring-driven Full Play Time: 3 minutes 30 seconds Height: approx. 11cm or 4.33inch Diameter: approx. 7cm or 2.76inch Weight: approx. 84g Package Included: 1 x Music Box Only Note: 1. Please allow 0-2cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.