The Sennheiser EW-D SKM-S BASE SET (S1-7) is a versatile digital wireless system for handheld microphone users who already own a compatible Evolution Wireless Digital capsule. Operating in the UK-legal 606–662 MHz range, it includes the SKM-S handheld transmitter with programmable mute switch and the EW-D EM half-rack receiver.Part of the Evolution Wireless Digital family, this set delivers outstanding 24-bit audio quality, intelligent setup via Bluetooth with the Smart Assist App, and reliable performance even in congested RF environments. Just add your preferred mic capsule to create a tailored wireless solution for vocals, speech, or performance.