Sennheiser EW 100-835 G4-S Wireless Handheld Microphone System with rack mount RX.Versatile wireless systems for those who sing, speak or play instruments with up to 42 MHz tuning bandwidth in a stable UHF range and fast, simultaneous setup of up to 12 linked systems. State-of-the-art live sound featuring Sennheiser‘s renowned e 835, e 845 and e 865 capsules on a lightweight aluminum transmitter with integrated mute switch.