Bluetooth sing-along system streams music for your child to sing with. Helps improve overall confidence and linguistic processing in children. Connect to devices via Bluetooth or line-in input to play music. Mood LED lights. Echo control for a fun echo voice effect. Two microphone jacks with volume control (additional microphone sold separately). Works along with the free Singing Machine Kids Music App for Android and iOS devices. Use Adapter or 8 CC batteries for portable use (batteries NOT included). Includes 1 wired microphone and power adapter.