The American Audio WM-419 is a 4-channel UHF wireless microphone system that includes four wireless microphones, a wireless receiver with individual volume control and XLR audio output for each microphone, batteries and four mic clips. The WM-419 features American Audio's Intelligent frequency Autoscan with IR synchronization with 50 channels per receiver (200 total), as well as, 16-Bit Pilot Technology to assist with eliminating frequency interface. The WM-219 is designed for use in PA, karaoke, mobile entertainers, schools and houses of worship. It has a wireless range of 300 feet / 90M (line of site) and each microphone has 6-10-hour battery life.