Sennheiser EW-DX SKM-S Digital Wireless Handheld Transmitter with Mute Switch (R1-9: 520 to 607 MHz)

The Sennheiser 509413 is a handheld transmitter that integrates smoothly with Evolution Wireless Digital systems, giving performers and presenters a dependable way to move freely while maintaining high-quality audio. It operates in the R1-9 UHF band from 520 to 607 MHz, a range that balances robust signal strength with regulatory flexibility in many regions.

This model accepts the full lineup of Sennheiser and Neumann microphone capsules, so you can tailor the tone to suit a rock vocalist one night and a spoken-word presenter the next. A programmable mute switch allows quick, silent control of the signal without reaching for the receiver or mixing desk, making it equally at home on concert stages, conference floors, and in lecture halls.

The housing is made of metal to withstand daily transport, rehearsal, and setup. Inside, digital transmission keeps the signal clear over distances up to 328 feet, giving talent the freedom to roam even large venues. Bluetooth connectivity speeds up pairing with compatible receivers and enables remote configuration through the Sennheiser app, which helps engineers adjust settings without interrupting rehearsal or sound-check.

Power options are flexible. With the optional BA 70 lithium-ion pack, the transmitter can run for as long as 12 hours, and built-in charging contacts let you dock it directly in the CHG 70N charger between sets. An E-Ink display shows essential information such as frequency, battery status, and mute state even when the unit is switched off, so you can confirm settings at a glance before stepping on stage.

• Digital UHF wireless technology for clear, low-latency audio
• Programmable mute switch for instant on-mic control
• Operates in the R1-9 band (520-607 MHz)
• Works with a wide range of Sennheiser and Neumann microphone capsules
• Up to 12 hours of run time with the optional rechargeable battery pack
• Metal housing built to handle everyday stage use
• E-Ink display keeps key settings visible even when powered down
• Bluetooth support for quick pairing and app-based remote control
• Charging contacts compatible with the CHG 70N dock