This Smart Key is an interactive toy for babies that teaches music, colours, sounds and vehicles. It also talks to your little one. Slide the blue switch to turn it on and play. The big chunky key is filled with learning and fun. Three beads reinforce learning and provide tactile stimulation and exploration. Automatic shut-off preserves battery life. Durable design for long-lasting play. Requires 5.1cm AAA" batteries (not included).