Sennheiser SKM 100 G4-S Handheld Wireless Microphone Transmitter with Mute Switch, No Mic Capsule (G: 566 to 608 MHz)

The Sennheiser 509751 is a handheld wireless transmitter that forms part of the evolution wireless G4 family. It operates in the G band from 566 to 608 MHz and pairs directly with the EM 100 G4 receiver. Because the unit ships without a microphone capsule, you can choose the exact capsule that matches your vocal style, instrument, or speaking application.

Sennheiser builds the SKM 100 G4-S with a metal housing that stands up to life on the road while remaining light enough for hours of comfortable use. A convenient mute switch sits within thumb reach, letting performers, presenters, or worship leaders cut the signal instantly between songs or speakers without touching the receiver.

Power comes from two AA batteries for as long as eight hours, so most shows, services, or corporate events finish well before you need a battery change. If you use Sennheiser’s optional rechargeable pack, you gain quick top-ups and lower long-term running costs. A backlit LCD keeps frequency, battery status, and RF strength clear on dark stages.

With a range that stretches up to 330 feet in ideal conditions, the transmitter gives singers freedom to work the entire stage and allows hosts to move naturally through an audience. An adjustable gain span of 48 dB helps match anything from a delicate vocal to a high-output dynamic capsule. Backward compatibility with earlier evolution systems means you can upgrade a single link in your chain without replacing every component.

Whether you manage a small club, run sound for a house of worship, or need a dependable handheld for conference venues, the SKM 100 G4-S offers the flexibility to build a wireless rig around your specific performance and budget needs.

• Handheld wireless transmitter with integrated mute switch
• Works with the EM 100 G4 receiver
• Accepts Sennheiser interchangeable capsules (capsule not included)
• Transmission range up to 330 feet / 100 meters
• Operates up to 8 hours on two AA batteries; compatible with optional rechargeable pack
• 48 dB gain adjustment for optimal headroom
• Backlit LCD shows frequency, battery level, and RF strength
• Metal housing built for stage and touring use
• Backward compatible with previous evolution wireless systems
• Frequency range: 566 to 608 MHz (G band)