The Sennheiser SKM 300 G4-S is part of their evolution wireless G4-Series. It's a lightweight aluminum microphone transmitter body with integral mute switch. Engineered to accept Sennheiser's interchangeable mic capsules, each of which has its own mic characteristics based on one of Sennheiser's renowned e-series wired microphones (Note: this system REQUIRES a capsule for fully functional operation; see "Compatible microphone capsules" below, and also please refer to the "ACCESSORIES" tab above. Capsules and e-series mics are all sold separately). This terrific transmitter body comes in 2 versions, each based on frequency range (please specify when ordering) AW+ (470 - 558 MHz)GW1 (558 - 608 MHz)Compatible microphone capsules (sold separately): Sennheiser: MMD 835 BK MMD 845 MME 865 BK MMD 935 BK MMD 945 BK MMK 965-1 BKevolution wireless G4 300 SeriesTop choice for your business, and top of the class in education. The G4 300 Series employs the power of an increased switching bandwidth of up to 88 MHz. Newer frequency ranges enable the operation of multi-channel setups with dozens of channels, while securing reliable operation - despite digital dividend.Sennheiser SKM 300 G4-S Includes: (1) SKM 300 G4-S handheld microphone transmitter body (ONLY) with mute switch(1) Mic clipSennheiser evolution wireless G4 300 Series Features: Evolving with you: Flexibility, Safety, PowerEasy to use, fast setup timeIntegrated network port allows control, monitoring and setup via Sennheiser Control Cockpit and WSM SoftwareBroad range of products and existing accessories (such as microphones) allows usage in any kind of environmentUp to 88 MHz bandwidth; up to 32 channelsIncreased RF output power (10/30/50 mW)Transmission Range: up to 330 ft (100 m)Compatible with wireless speaker system LSP 500 PRO