An extra mic is always a good idea when you purchase your Singing Machine system. Singing alone is fun, but singing with someone else is a party! Simply connect your new Singing Machine SMM225 Unidirectional Dynamic Wired microphone to your karaoke machine’s microphone jack. It's an nexpensive, good-sounding mic. Features: Unidirectional dynamic wired microphone LED disco lights on the front of the microphone grip synchronize to music/voice or use it in random selection modes Wide frequency response and high sensitivity Battery operated, requires 3-AAA (included) 3.5mm adapter included. 10 feet cord NOTE: Professionally refurbished item with 30-day warranty.