Video Casting technology - project the SMC Karaoke app content to your TV. Bluetooth audio streaming from any music device. Echo voice effect provides professional-sounding performances. Powerful sound experience with dynamic audio. Music syncing lights for immersive karaoke atmosphere. Rotatable microphone holder. Device cradle. Line-in connection for external music devices. Requires 2 AA batteries (NOT included). Dimensions: 7.8"W x 8"L x 9.9"H. Includes: Wireless microphone. AC adapter cord. 1 Month access to Singing Machine karaoke app.