The Groove Mini is a portable karaoke system that works with all music and karaoke apps. With Bluetooth, music can be streamed from compatible devices. This karaoke system features six fun voice-changing effects, including Echo, Male, Female, Robot, Chipmunk, and Radio. The multicolored LED lights adapt to the mood and music. The operation is simple and ideal for children. It has a built-in speaker for a dynamic sound experience. Additionally, there is a line-in jack to connect a smartphone, tablet, MP3 player, or other audio devices. With two microphone inputs, the Groove Mini is perfect for a duet. One microphone is included. The device can optionally be powered by 6 C batteries (not included).