Works with all music and karaoke apps This karaoke machine features Bluetooth for wireless audio streaming from compatible devices (external devices not included) Six Voice-Changing Effects: Echo, Male, Female, Robot, Chipmunk and Radio Multi-colored LED lights synchronize to the music Connect to your TV for scrolling CDG karaoke lyrics via the included RCA cable (TV not included) The Singing Machine karaoke system has a Built-In speaker for a dynamic sound system Secure resting cradle fits a variety of tablets or other mobile devices Two microphone inputs for karaoke duets (one microphone included) Line-in to connect to your personal smartphone, tablet, MP3 or other audio devices Option to operate chord-free with 6 “C” size batteries (AC adapter included. Batteries not included)