6 built-in voice changing effects: Echo - Female - Male - Chipmunk -Robot - Radio Streams audio from any Bluetoothcompatible device Play MP4 files from USB por Line-in to connect tablet, smartphone or other audio devices Two microphone inputs for duets (second microphone available separately) The Groove Mini combines your favorite Classic features with updated vocal-changing fun! Up your singing game with 6 fun voice-changing effects. Enjoy a light show that synchronizes to your voice.Connect your Bluetooth device and sing along to your favorite karaoke songs. Take this portable machine with you on your next road trip, tailgate, or pool party: simply add 6 "C" size batteries(batteries not included). Did anyone say Karaoke Party? Connect the Groove Mini to your TV via RCA cables and share your CDG's lyrics on the big screen. Create fun, lasting, singable moments with The Groove Mini!