The Disney Doc McStuffins Sing-Along Boombox provides virtually endless musical fun. It's an awesome choice for fans of the popular cartoon series. Kids can connect an MP3 player via the line-in jack to sing along to their own music. They can rock out with the included microphone. Pre-recorded speech and sound effects from the cartoon add extra fun. A pretend reflex hammer and syringe come with it to complete the Doc McStuffins theme. Other features include an easy-carry handle, bright colors and adorable decals. This Disney sing-along boombox requires three AA batteries.