Croove Portable Bluetooth Karaoke Party System Powerful Compact and High Quality Party Karaoke Machine with high power sound system Connect your phone, computer or tablet via Bluetooth/USB/AUX, Plays MP3 or WMA files, LED indicator tells you which input you're using, Separate volume adjustments for speaker and mic, rewind/forward controls Quality Karaoke Microphone for Sing-a-long, Requires four AA batteries and sold separately