The new Sennheiser Evolution Wireless Digital EW-D SKM-S (R1-6) rugged and versatile handheld transmitter (capsule not included) is compatible with a wide range of Sennheiser and Neumann microphone capsules, and it is part of a system that automatically secures the most reliable signal in a matter of seconds. An equidistant tuning grid equally spaces frequencies alongside each other, replacing the need for RF coordination or wireless expertise of any kind. Sennheiser's Smart Assist app puts full control right in the palm of your hand, providing automated setup, remote monitoring and mobile access to every system setting, all from the convenience of your Android or iOS device.