Sennheiser EW 300 G4-Base SKM-S Wireless Handheld Microphone System (AW+: 470 to 558 MHz)

The Sennheiser 509778 is a wireless handheld microphone system from the EW 300 G4-Base family, created to give presenters, trainers, and event staff a reliable path to clear speech in conference rooms, classrooms, and live venues.

Working in the AW+ band that spans 470 to 558 MHz, the system offers an 88 MHz tuning window and can run up to 32 compatible channels at once. This flexibility helps technical teams build multi-room or multi-presenter setups without bumping into interference.

The included SKM 300 G4-S handheld transmitter features a housing made of metal for long-term durability. Its interchangeable capsule mount lets you choose the microphone head that matches the speaker’s voice or the room acoustics, and you can swap capsules without replacing the entire transmitter.

The rackmount receiver uses true diversity antenna technology to hold a steady signal, even when the presenter walks through an audience or across a stage. An Ethernet port ties the unit into Sennheiser Control Cockpit and Wireless Systems Manager software, giving AV and IT staff the power to scan frequencies, monitor battery life, and adjust audio levels from a desktop or tablet.

Day-to-day operation stays simple. A bright OLED screen and an easy-to-use jog wheel guide you through frequency scans and menu options, making last-minute changes straightforward even in low light. Two AA batteries or an optional rechargeable pack keep the transmitter running for up to eight hours, and the link remains solid out to about 330 feet so speakers can move naturally.

Whether you are equipping a boardroom, outfitting a lecture hall, or managing a corporate roadshow, the EW 300 G4 Base SKM-S system brings professional speech clarity, flexible control, and dependable performance in a format that is quick to deploy and maintain.

Highlights:

• 88 MHz tuning range supports up to 32 simultaneous channels
• True diversity receiver maintains consistent RF performance
• Ethernet connectivity enables network control through Sennheiser software
• Operating range of about 330 feet (100 meters)
• Accepts interchangeable Sennheiser microphone capsules (capsule not included)
• Up to eight hours of runtime on two AA cells or an optional rechargeable pack
• Metal transmitter housing built for everyday use