The American Audio WU-419V is a 4-channel UHF wireless microphone system that includes four wireless microphones, four different color coded rings (to differentiate each microphone) and a wireless receive with individual volume control and audio input for each microphone. The WU-419V is designed for use in PA, karaoke, mobile entertainers, schools and houses of worship. It has a wireless range of 300ft/90M (line of site) and each microphone has 6-10 hour battery life.