Keep the party going with The Singing Machine Wireless Microphone. The Singing Machine SMM107 Microphone features a unidirectional dynamic microphone and a VHF receiver offering a wide frequency response and high sensitivity. This is the perfect microphone for stand-alone karaoke machines for you to perform either by yourself or with friends. If you are looking to show off your singing talents or party with friends, this microphone is perfect for you! Please note: you can only use one SMM107 per machine, as more than one receiver will cause interference. * Works with all standard Singing Machine karaoke systems * Unidirectional Dynamic Wireless Microphone SMM107 * VHF receiver * Requires two 9V batteries (sold separately) * Perfect to use with Stand-Alone Karaoke Machines * You can only use one SMM107 per machine, as more than one receiver will cause interference