The SENNHEISER EW-D 835-S : S1-7 606.2-662MHZ is a versatile 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 Sennheiser‘s renowned e 835 capsule on a lightweight handheld transmitter with an integrated mute switch.