Sennheiser Wireless Microphone SystemExperience flawless control over every performance with the Sennheiser Wireless Microphone System. Specifically engineered for professional live sound, the G4 In Ear Monitoring Sets deliver a rugged, all in one wireless monitoring solution that keeps you on top of your game, on stage and off. This system is built to weather the demands of touring and club gigs alike, offering crystal clear, low latency monitoring, dependable wireless stability, and