The Singing Machine Sing Cast K-box is a first of its kind to feature video casting technology to project HD karaoke videos from the SMC Karaoke App. Cast to your tv and share the fun with two microphone jacks for duets (one microphone included). Audio content can also be played via your Bluetooth compatible devices. Hit the lead vocal-off button to remove vocals from your favorite songs and take over the show. Built with over 40 multi-colored LED lights that synchronize to the music plus speakers in a custom designed cabinet for a crisp and clear sound, you are party-ready at a moment's notice!