Due to government regulations, some wireless products will not work in certain areas. This product works on the AS frequency band. The fourth-generation Evolution wireless series makes professional wireless technology even more simple, flexible and reliable. For musicians, filmmakers, convention speakers and for use in the auditorium: G4 is a system that grows with you. The SK 300 G4-RC is a robust bodypack transmitter for use with any Sennheiser headmic or lavalier microphone (SL-HEADMIC1 1, ME 2 recommended). With increased bandwidth and transmission power for evolution wireless G4 300 Series systems, the SK 300 G4-RC delivers exceptional speech intelligibility in Business and Education. Features Robust bodypack transmitter for use with any Sennheiser headmic or lavalier microphone (SL-HEADMIC1 1, ME 2 recommended) Easy to use, fast setup time Integrated network port allows control, monitoring and setup via Sennheiser Control Cockpit and WSM Software Broad range of products and existing accessories (such as microphones) allows usage in any kind of environment Up to 88 MHz bandwidth, up to 32 channels Increased RF output power (10/30/50 mW) Transmission Range: up to 100 meters Compatible with wireless speaker system LSP 500 PRO RC (remote control) switch available for the bodypack transmitter