Electro-Voice R300-HD Wireless Handheld Microphone System Designed for Club Sound, House of Worship, Performance Sports Venues and other applications. ClearScan finds the clearest channel available with the touch of one button. EZsync infrared channel transfer from the receiver to the transmitter for easy and error-free setup. PL22 cardioid dynamic microphone element for crisp, clear vocals in any application. 14 hour battery life from two AA alkaline batteries.