Sennheiser EW Wireless Lavalier Microphone System, EW112G3 A (516-558 MHz) True Diversity Rack-Mount Wireless Microphone System with Samson SE10T Headset Microphone Sturdy metal housing (transmitter and receiver) Automatic frequency scan feature searches for available frequencies Wireless synchronization of transmitters via infrared interface User-friendly menu operation with more control options Includes Samson SE10T Headset compatible with most wireless systems