Sennheiser EW-D 835-S SET (S1-7), 606.2-662MHzVersatile and feature rich digital wireless system for those who sing, speak or play instruments that allows for seamless product pairing and management via the EW D Smart Assist App. Receive state of the art live sound featuring Sennheisers renowned e 835 capsule on a lightweight handheld transmitter with an integrated mute switch. Features: Digital transmission operating in the UHF spectrum greatly enhances range, reliability and scalability Smart